One, how to open a Class B lock.
Regardless of the security level of the lock cylinder, it can be opened directly with a key. If the key is lost, it is necessary to call a locksmith to open the lock, as locks of Grade B have better security performance and are typically not easily opened by individuals without specialized training.
Two. Can a thief with a Class B lock open a locked door?
Depending on the situation.
1、Using a key to lock the door from the inside is equivalent to using a key to lock the door from the outside, and conversely, if someone from the outside locks the door, the person inside can also unlock it with a key. Therefore, if someone obtains your key, they can open the door.
2. To prevent unauthorized entry from the outside, the only correct method is to secure the internal lock, which is a manual knob. This is a manual latch mechanism that is independent of the lock itself, ensuring that the door remains secure from the outside.
3. When you are away, double-check that the door is securely locked with multiple key turns, and keep your keys in a safe place to prevent loss. If your keys are secure, it significantly reduces the chances of unauthorized entry. If you still feel uneasy, you can install a smart security system on your door or replace the B-grade security lock with a more secure C-grade security lock.