Last updated: August 21, 2026
How to tell if a lock was picked before moving in: Toronto Cabbagetown signs come down to four physical marks: bright fresh scratches inside the keyway, peening or burring on the cylinder face, a plug that wobbles or a backed-out set screw, and a key that suddenly needs jiggling. Check all four with your phone flashlight in about five minutes. Then rekey anyway; because the far bigger risk in a rental turnover isn't a picked lock, it's uncounted copies of your key floating around the neighborhood.
- Scratches around the keyhole are normal key wear. Scratches inside the keyway, on the upper pin chambers, are the real tell.
- Bump-key attacks leave a distinct signature: small peened dents and a burr on the cylinder face where the hammer struck the key bow.
- A plug that rotates slightly with no key inserted, or a deadbolt set screw that's backed off, usually means someone had the cylinder out.
- Kwikset SmartKey cylinders are hard to pick but have a known bypass that leaves almost no marks: absence of pick marks is not proof of anything.
- Rekeying is priced per job.
The Short Answer
Knowing how to tell if a lock was picked before moving in comes down to reading the difference between wear and attack. Wear is dull, even, and spread around the outside of the cylinder face where a keyring has been swinging against brass for six years. Attack is bright, fresh, concentrated, and lives inside the keyway or on one specific edge of the plug.
If you're a renter who just signed on a Cabbagetown Victorian conversion and got handed two worn keys on a bent split ring, here's the honest field answer: even a clean lock tells you nothing about who has a copy of that key. A picked lock is rare. A key that was cut at a hardware store in 2019 by a previous tenant's ex-roommate is not rare at all. The inspection below is worth doing - and then you rekey regardless of what you find.
The Full Answer - The 4 Signs We Look For
When a technician gets called to a Cabbagetown, Riverdale, or Leslieville unit for a "was this lock tampered with?" inspection, we're not guessing. We pull the cylinder, hold it under a light, and look for four specific things in a specific order.
Sign 1: Bright scratches inside the keyway - not around it
Almost every lock in Toronto older than a year has a halo of fine scratches around the keyhole. That's a key missing the slot in the dark. It means nothing.
Picking marks are different and they're inside. Shine a phone flashlight straight down the keyway at a shallow angle and look at two zones: the flat floor of the keyway, where a tension wrench sits, and the roof of the keyway under the pin chambers, where a hook or rake drags. A picked lock shows short, parallel, unusually bright scoring on the brass ceiling of the keyway, running front-to-back. Fresh brass exposure looks almost pink-gold against the darker oxidized surface around it.
Tension wrench marks are the more reliable of the two. Look at the bottom lip of the keyway, right at the mouth. A wrench held under torque for thirty seconds while someone rakes a five-pin Weiser cylinder leaves a small flattened bruise or a twin scuff at the lower corners. That's not something a key does.
Sign 2: Peening and burring on the cylinder face - the bump-key signature
Bump keys are far more common than picks in real-world residential entry, because they take no skill. A bump key is a blank cut to the deepest bitting on every position, inserted one pin short, then struck with a light hammer or a screwdriver handle while torque is applied.
The striking is what gives it away. Look at the cylinder face immediately around the keyway opening for tiny crescent dents, a raised burr along the top edge of the slot, or a slightly mushroomed lip. On a brass Weiser or Schlage face, these show as bright pinpoints in a cluster - not a smooth ring. Inside, bumping peens the pin tips flat, which is why a bumped lock often develops a gritty, notchy feel a few weeks later.
One more thing. Bumping is loud. If you're in a semi-detached Cabbagetown rowhouse where you can hear your neighbor's kettle, ask them whether they heard repeated tapping at the front door. People remember it.
"The forensic marks people search for online are real, but they answer the wrong question. In an older downtown Toronto unit, the far more likely story isn't a stranger with picks - it's a cylinder that's been rekeyed twice in nine years and still has keys in circulation from two tenants ago. Nothing on the lock face will ever show you that." - Colourflly Locksmith Team
Sign 3: A loose plug, a backed-out set screw, or a cylinder that moves
Grab the cylinder ring with your fingers, no key inserted, and try to rotate it. A properly installed deadbolt cylinder should not budge. If it turns even a few degrees, or if you can rock it in and out of the door, someone has had that lock apart - either a locksmith, a landlord doing a rushed rekey, or someone who shouldn't have.
On mortise locks - extremely common in the century-old rowhouses through Cabbagetown and parts of Riverdale - the cylinder is held by a set screw in the edge of the door under the faceplate. Open the door, look at the latch edge. A set screw that's backed off, chewed, or missing entirely is a red flag. So is a faceplate whose screw heads are freshly scarred while the plate itself is dull with old paint.
The cheap version of "picking" is just unscrewing the thing. We see it more than actual lockpicking.
Sign 4: The key suddenly needs jiggling, or feels gritty
A five-pin cylinder that has been picked or bumped hard often loses its clean feel. Springs get compressed unevenly, pin tips deform, and a driver pin can pick up a tiny burr that catches at the shear line. The result: a key that turns fine one day and needs a slight lift-and-jiggle the next.
Test it properly. Insert the key fully, then turn without pulling, pushing, or lifting. If it only opens when you apply upward pressure, something inside is off. That's not automatically tampering - worn keys and 40-year-old brass do the same thing - but combined with signs 1 through 3 it builds a picture.
Also try the key in the cold. Downtown Toronto doors swell and shift between a damp November and a dry February, and a lock that binds only in January is usually a door and strike alignment problem, not a security one.
The fifth sign nobody checks: the frame, strike, and mail slot
Most non-professional entry in older Toronto housing isn't through the cylinder at all. Look at the strike plate: are the screws only 3/4" long? Are there hairline splits in the jamb beside it? Is there a compression bruise on the door edge opposite the latch, where a card or shim was worked in to loid the spring latch?
Cabbagetown and The Annex are full of original front doors with brass mail slots at waist height. A mail slot within arm's reach of a thumbturn deadbolt is a standing invitation for a hook tool. Check whether the interior flap shows fresh scrape marks on its underside - that's a genuinely useful tell, and it's not on any of the generic "signs your lock was tampered with" articles you'll find online.
The uncomfortable part: no marks doesn't mean no entry
Kwikset SmartKey cylinders - the ones with the small extra slot beside the keyway, sold everywhere in Canada because they let a homeowner rekey in seconds - resist conventional pin picking well, because there are no pins to set. But the mechanism has a documented bypass using a thin tool through the keyway, and it leaves almost nothing visible. Honestly, this is the one that changed how we answer this question. A pristine SmartKey face proves the lock wasn't picked. It proves nothing else.
Same logic in reverse: a beat-up, scratched-to-hell cylinder on a Leslieville side door might have been serviced three times by legitimate trades. Marks are evidence, not verdicts.
Sign-by-Sign: What It Looks Like and What to Do
| Sign | What you'll see | Likely meaning | Action |
|---|---|---|---|
| Halo scratches around keyhole | Dull, even, radiating outward | Normal key wear | Ignore |
| Bright parallel scoring inside keyway | Pink-gold fresh brass on keyway roof | Pick or rake attempt | Rekey or replace cylinder |
| Peened dents / burr on face | Crescent pinpoints, mushroomed lip | Bump-key attempt | Replace with bump-resistant cylinder |
| Plug rotates / set screw backed out | Cylinder wobbles or spins slightly | Lock was removed by someone | Full lock change, document it |
| Key sticks, needs lifting | Turns only with upward pressure | Worn pins, or post-bump damage | Rekey with new pins and springs |
| Scrapes under mail slot flap | Fresh bright gouges on interior lip | Fishing tool through the slot | Add a slot cage or double-cylinder deadbolt |
The 5-Minute Move-In Lock Inspection
Do this before the boxes come off the truck. All you need is a phone with a flashlight and a Phillips screwdriver. It works on any residential entry lock in Toronto, from a 1978 Weiser deadbolt in Wychwood to a Schlage B60N on a Liberty Village townhouse.
Hold the flashlight almost flat against the door so light skims across the brass. Shoot close-up. Peening and burrs show up in raking light that vanish in flat light.
Phone camera on maximum zoom, flashlight from the side. Look for bright scoring on the keyway ceiling and bruising at the lower mouth corners.
No key in the lock. Try to rotate and rock the outside cylinder. Any movement means the lock has been apart.
Check faceplate screws, the mortise set screw, the latch bolt for shim scuffs, and the jamb beside the strike for splits or fresh filler.
Ask your landlord in writing how many keys exist, who holds them, and when the lock was last rekeyed. The answer - or the silence - tells you more than any scratch.
When the Answer Is Different
The four-signs method assumes a standard pin-tumbler residential lock. Several common Toronto situations change the reading entirely.
If it's a high-security cylinder
Mul-T-Lock MT5+, Medeco M3, and Abloy Protec2 cylinders use telescopic pins, rotating pins, or disc detainers that defeat casual picking and bumping outright. On these, faint keyway scratches are almost always from the key itself. If you're in a Rosedale, Forest Hill, or Yorkville property already fitted with one of these, the tampering question shifts from the cylinder to the door hardware and the key control paperwork. High-security cylinder replacement is priced per job.
If it's a condo or a building with a restricted key system
In a downtown Toronto condo on a restricted keyway, your unit key can't be duplicated at a kiosk - copies come through property management on signature. That's genuinely good news for the key-in-circulation problem. But it also means your unit lock is usually part of a master key system, so you cannot rekey it independently. For the property manager juggling three buildings, this is why turnover rekeys get batched: it's a system change, not a single lock.
If it's a smart lock or keypad deadbolt
On a Yale Assure or Schlage Encode, the tampering evidence is digital, not physical. Pull the access log, delete every existing user code including the installer code, and check whether the lock is still paired to a previous resident's account. A worn spot on three of the ten keypad digits is a real-world tell that a code has been in use for a long time - that alone is reason to change it.
If you find genuine evidence of forced or covert entry
Don't clean it, don't lubricate it, don't spray anything into the keyway. Photograph everything, keep the cylinder if it's replaced, notify your landlord in writing, and file a report with Toronto Police if there's any sign of unauthorized entry. Graphite or oil sprayed into a keyway destroys the exact surface evidence you'd want a technician to read. We've had locks arrive that had been "helpfully" lubricated first. Nothing left to see.
FAQ
How long do lock picking marks stay visible on a cylinder?
Lock picking marks on a brass cylinder stay visible essentially forever, but they stop looking fresh within roughly two to eight weeks as the exposed brass oxidizes back to a darker tone and normal key traffic blends the surface. That's why the bright pink-gold color of the scoring matters as much as the scoring itself. If the marks look dull and blended, they're old - possibly from a legitimate locksmith opening years ago.
Should I rekey or fully replace the locks when I move into a Toronto rental?
Rekeying is the right call in most Toronto rentals; it retires every existing key while keeping the hardware, and is priced per job. Full replacement makes sense when the deadbolt is below ANSI/BHMA Grade 2, when the plug is loose, or when you found bump peening. A new Grade 2 deadbolt is priced per job.
Can a locksmith actually prove a lock was picked?
A locksmith can identify tool marks consistent with picking or bumping by disassembling the cylinder and examining the pin tips, springs, and plug under magnification - but "consistent with" is the honest ceiling for a mobile field inspection. Formal forensic locksmithing that stands up as evidence requires lab-grade comparison microscopy and chain-of-custody handling. For a Cabbagetown renter, the practical outcome is the same either way: rekey the unit.
What's the single best upgrade for an old Cabbagetown front door?
Longer strike screws. Swapping the standard 3/4-inch strike plate screws for 3-inch screws that bite into the framing stud behind the jamb costs a few dollars and dramatically increases kick-in resistance on a century-old Cabbagetown door - where the jamb is often soft, painted-over pine. Pair that with a Grade 2 or better deadbolt with at least a 1-inch throw, and you've fixed the two weakest points before you ever touch the cylinder.
Sources
- Tenant and landlord rules on changing locks and providing keys - Residential Tenancies Act, 2006 (Ontario)
- Plain-language summary of renter rights in Ontario, including locks and entry - Renting in Ontario: Your Rights, Government of Ontario
- ANSI/BHMA Grade 1, 2 and 3 performance standards referenced for deadbolt selection - Builders Hardware Manufacturers Association (BHMA)
- High-security cylinder platforms named in this article - Mul-T-Lock
Run the five-minute check. Photograph what you find. Then decide with your eyes open - because knowing how to tell if a lock was picked before moving in matters far less than knowing exactly how many working keys exist for the door you sleep behind tonight. Our mobile technicians handle move-in rekeys, cylinder swaps and same-day lock changes across Cabbagetown, Riverdale, The Annex, Leslieville and the downtown core, and we'll tell you straight when a lock doesn't need touching.
Colourflly Locksmith
Have a similar question about a lock you just inherited with a lease?
Book a Move-In Lock Inspection & Rekey in Cabbagetown →
🎧 Listen to article
- Someone Tried to Pick My Lock in Wychwood: A Customer Asked What Signs to Look For After a Break-In Attempt
- Rekeying Locks in a Cabbagetown Rooming House
- Cabbagetown Row Houses Have a Lock Vulnerability Most Locksmiths Don't Catch: Here's What It Is
- A Customer Asked: "Can a Toronto Locksmith Rekey My Lock Without the Original Key?" The Full Answer
- Home Lock Problems in Toronto? What Every Homeowner Needs to Know
- Someone Tried to Pick My Lock in Wychwood: A Customer Asked What Signs to Look For After a Break-In Attempt
- Rekeying Locks in a Cabbagetown Rooming House
- Cabbagetown Row Houses Have a Lock Vulnerability Most Locksmiths Don't Catch: Here's What It Is
- A Customer Asked: "Can a Toronto Locksmith Rekey My Lock Without the Original Key?" The Full Answer
- Home Lock Problems in Toronto? What Every Homeowner Needs to Know