door. rust is one sign that you need a replacement.
keys give us issues sometimes, and that is understandable, but when you have to wiggle and jiggle your keys in the lock to get the door unlocked, you know you have an actual problem. this could result in your key breaking off in the lock or the lock no longer working.
even if the key turns in the lock with ease, the door knob may be sticky. if you turn the knob and it feels like it is sticking, it is time to replace your locks and door knobs. again, you never know when this will fail and being locked out of 