If the door lock is jammed, you can try to find the cause of its failure yourself and eliminate it without replacing the entire mechanism. There are various ways to open an iron or wooden entrance door. It depends on the complexity of the locking system and the reason for its blocking. If you are not confident in your abilities, it is better to contact Emergency Locksmith London.
If the lock of the entrance door does not open from the inside, you should try to open the system from the outside by handing the keys to the neighbors. If the lock does not give in, you need to press the latch with any flat metal object.
More complex and expensive locking devices require experience working with them. To do this, you need to dismantle the door handle, push a thin wire into the larva of the device, find the latch and try to push it away.
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