Locksmith in Applewood HillsSmart locks,
fitted to a sound door

Often fatigue, though not the only cause. A brass blade is weakest where the deepest cut leaves the least metal, and thousands of turns can slowly work a crack into that spot. Then one morning something asks more of it: a frozen cylinder, a bolt binding in a swollen door, grit in the keyway, or turning before the key was fully in. A bent, worn or poorly cut key can also fail on its own, with no such trigger. The lock is inspected afterwards to find which applied.

You can, given a key that currently operates the lock, the maker's reset tool, the new key and the steps followed in order. Trouble tends to arrive when the old key is missing, when the new key belongs to a different keyway, or when a reset stalls halfway and the cylinder then accepts neither key. A locksmith carries the tool and the procedure, can check that the new key suits the rest of your doors, and can fit a standard cylinder if a forced reset has broken the mechanism.

Yes, and it is a common change for anyone who finds a knob hard to grip. Levers use the same bore and backset as knobs, so the swap is usually a direct fit. Levers are handed, so the locksmith checks which way the door swings and chooses or adjusts the lever accordingly. A keyed entry lever pairs well with a deadbolt above it, and interior passage and privacy levers complete the set.

Yes, provided the padlocks themselves are a type built to be rekeyed or matched, which is a feature of the specific model rather than something price or quality decides. The locksmith either rekeys the existing padlocks to a shared combination or replaces any that cannot be rekeyed with new ones cut to match. The result is one key working the front gate, the side gate and the shed, instead of a separate key for each, though a utility gate can be left on its own key.