I do this every so often because it caught me by surprise once –
If you have a deadbolt-type lock on your front (or other) door, remember to check once in awhile to see if the screws holding it in are tight. They can sometimes work themselves so loose that they will keep you from opening the door. They wouldn’t necessarily be sticking out hella far. It only takes a short amount of screw protruding to block the lock from turning.
While you’re at it, check the screws on your bannisters, on the door hinges, stuff like that. I do this every year or so, and I’m always surprised how much they can come loose.
That is all