What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
A lock that is stiff, will not turn, or will not latch is usually giving you a warning before it gives you a lockout. The two families of cause feel similar at the key but are fixed very differently: worn internal pins and a tired cylinder inside the lock itself, or a door and frame that have shifted so the bolt or latch no longer lines up with its strike. Weather is a useful clue, since a lock that is worse in humid months or deep cold is often a door-fit problem, while one that is stiff year-round with a sloppy, gritty key feel is usually the cylinder wearing out.
Do not ignore a worsening lock. A stiff lock that you force daily is a broken key or a complete failure in the making, and a door that does not latch reliably is a security problem tonight, not a cosmetic one. Book help this week, sooner if the key needs real force, if the bolt does not throw fully, or if the door can be pushed open while supposedly locked. In the meantime, be gentle: force is what turns a serviceable lock into an emergency call.
Inside the cylinder, small pins and springs take the wear of every insertion and turn. Over years they round, weaken, and stop setting cleanly, which is felt as a gritty, vague key action where you have to lift, jiggle, or pull the key slightly out to make it turn. That jiggle ritual is the classic signature of cylinder wear.
Doors sag as hinge screws loosen and buildings shift seasonally. The bolt then meets the edge of its strike hole instead of sliding into it, so locking takes a lift or a push on the door. If the lock works smoothly with the door open but fights you with it closed, alignment, not the lock, is the problem.
Dust, pocket lint carried in on keys, and corrosion roughen the cylinder, and oil-based lubricants make it worse over time by holding that grit in place. A lock that has been oiled for years often feels worse than a dry one. Dry graphite lubricant is the appropriate product for a keyway, used sparingly.
Sometimes the lock is fine and the key is the worn part: a bent blade, rounded teeth from years of use, or a cheap copy cut slightly off specification. If one key struggles and another, less-used key turns smoothly in the same lock, you have isolated the fault to the key without touching a screwdriver.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $75–$220 |
| Major job — complex, hidden, or replacement-level work | $220–$500 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Reasonable homeowner steps are graphite lubrication, testing a spare key, and tightening hinge screws. Call a locksmith when the lock is stiff with the door open and with a good key, when the bolt will not throw or retract fully, or when alignment adjustments do not hold. A pro can service or replace the cylinder, correct the strike and door fit properly, and tell you honestly whether the lock body itself is at end of life. Replacing a whole lock to fix an alignment problem, or adjusting a door to mask a dead cylinder, both waste the visit, so the open-door test is worth doing first.
Wooden doors and frames absorb moisture in humid weather and swell slightly, which is enough to move a bolt out of line with its strike by the small amount that matters. A lock that binds seasonally and frees up when the air dries is almost always a fit problem. The fix is adjusting the strike, hinges, or door fit to allow for that movement, not replacing a cylinder that works perfectly for half the year.
It often feels like it helps for a week and then leaves the lock worse, because oil holds dust and grit inside the cylinder where the pins need to move freely. Dry graphite is the product locksmiths recommend for keyways specifically because it lubricates without that residue. If the lock has a long history of oil, a professional cleaning or a cylinder service may be needed to get back to a smooth action.
Yes, and it is a useful warning. Needing to lift, jiggle, or partially withdraw the key means the pins are no longer setting cleanly on a worn key, a worn cylinder, or both. It will not improve, and the end stage is a key that stops working entirely or breaks under the extra force. Getting it assessed while it still works is cheaper and calmer than waiting for the lockout.
Repair or servicing makes sense when the lock body and cylinder are sound and the fault is dirt, a worn key, or alignment. Replacement makes sense when the cylinder is worn out, parts for an older lock are unavailable, or you want to upgrade security or rekey anyway. Ask the locksmith to show you the wear they are seeing; a good one can explain in a sentence why your lock falls on one side of that line.
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