What should I do if the door lock at home is screwed tightly?

When the door lock is not installed, the opening and locking are normal, and it is very tight after installation. It can be judged that all parts are unevenly stressed during installation and cannot be in the original free state, resulting in the switch being not free. The easiest way is to drop a few drops of lubricating oil in the keyhole, or put pencil powder in it and try again. If it still can't be solved, it will have to be dismantled and reassembled. When reassembling, pay attention to the correct position. All screws should be tightened synchronously and step by step, instead of tightening one first and then the other. How many times should the lock be opened and closed in the middle? If the resistance is large, check and adjust.