The door is locked. How can I open it?

This kind of door is locked. First, decide whether to lock it in the door manually or with a key.

First, manual anti-lock braking. There must be someone inside, just wait for someone inside the door to open it.

Second, the key is locked. Now the door won't open, which proves that your key is missing. If you want to open the door lock without damaging it, you must have professional tools. Then, you can only hire a professional locksmith.

Third, if you want to unlock the lock yourself, you must remove the lock panel. First, slowly insert the head plane of the screwdriver along the contact surface between the door and the lock, then forcibly pry open the lock panel, remove the locking screw of the lock core, and then take out the lock core. Then, use a screwdriver to tilt and push up against the camshaft in the lock body, and the locked door can be opened.