Locks and handles are essential parts of a residential door because they support access and security. A handle may become loose after repeated use, while a lock can become difficult to operate because of worn internal parts or alignment issues. Sometimes the door and lock mechanism no longer line up correctly. Repairing these components may involve adjusting the strike plate, tightening fittings, or replacing damaged hardware. If a lock is broken or no longer provides reliable security, replacement may be the better option. Homeowners should avoid forcing a stuck key or handle because this can cause additional damage.