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It may be that the lock cylinder is broken, and it is recommended to replace the lock cylinder.
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It's good to turn it off again after going back some distance
1. All anti-theft door locks have been used with B key, it should not be so easy to break. You can ask the person who gave the key to take a look.
No, you'll have to change the cylinder.
You can remove the lock cylinder as follows: first remove the doorknob, and then unscrew it on the side of the lock, and the lock cylinder can be removed. Then go to the hardware store and buy the same lock cylinder and install it in the same way. >>>More
The most common security door lock keys are 6, and there are also 5 and 3 but rarely.
No, this definitely has no effect on the door, and the door lock just says that there is a small switch that has not been turned on. >>>More
Never heard of a doorbell at the location of the door lock. >>>More