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If the lock body and lock cylinder are faulty, it is recommended to find a professional lock shop master to help you check and repair.
Summary. Hello dear, happy to answer for you! The anti-theft door lock can be rotated but cannot be opened >>>More
If it is not an anti-lock, it can be judged that there is a problem with the lock cylinder. Of course, the premise is to open it with a personal key. If the pressure handle is opened, there may be a problem with the lock body, transmission mechanism and handle. >>>More
It should be caused by the loosening of the linkage mechanism between the doorknob and the inner bolt. >>>More
It's OK to change the lock cylinder, don't make it so complicated, the key can't be twisted, it's a problem with the lock cylinder.
For the sake of safety, it is better to install one or two locks and add a latch inside it, so that it is more secure!! It is better not to live in the middle of nowhere.