This paper aims at the emergency treatment when the door lock is stuck by foreign objects and cannot be opened. Generally, there are foreign objects stuck in the door lock, which can't be inserted with keys or fingers. Even if it is inserted, it is difficult to unscrew. In this case, we must find a way to unlock the door. First, determine whether the door opens inward or outward. If it opens inward, pull hard, if it opens outward, push hard.

Try to unlock the lock with a sharp knife.

Then we need a knife, sharp and thin. The sharper the tip, the better. First of all, hold the door from the outside of the bathroom door, and call the retractable part in the middle as the lock shaft to prevent the lock shaft from touching the lock groove and reduce friction. When the sharp knife is inserted into the gap of the lock groove, we should hold the lock shaft and exert force in the free direction of the lock shaft. Maybe it won't work once or twice, but try a few more times and maybe it will work.