1. Generally, the door lock cannot be opened due to external force, perhaps because the locktongue inside is unhooked, or the lock tongue is distorted in shape and the screw fixing the lock tongue falls off, which causes the door to jam and the door cannot be exited. If you go in, you can't get in. In this case, the best emergency treatment is to find the bolt and pull the screw that fell off from the crack in the door to locate it. This method is limited to situations where the door lock cannot be opened due to foreign material forces.
2. Ask the locksmith to unlock, and the unlock company to unlock.
3. It is aimed at emergency treatment in case the door lock cannot be opened due to the foreign object stuck in the door lock. Generally, a foreign object is stuck in the door lock and cannot be inserted with a key or finger. Even if it is inserted, it is difficult to twist it. In this case, it is necessary to find a way to twist the door lock.