What if the door key can be turned but can't be pulled out?

Prepare some oil. Cooking oil can also be applied to keys and keyhole with chopsticks or some fine objects. After several repetitions, try to turn the key. If not, put some oil on it. After repeated several times, the oil will penetrate into the depth of the lock core, so that the key can be inserted and unlocked normally.

Twist your head in the direction you can twist it, then twist it back quickly, press it in hard, and it will come out in a circle. If you still can't pull it out, you can try to see if the direction is right. If you still can't pull it out, you can ask the locksmith for help.

Information about locks

The earliest lock was a simple mechanism designed by the owner to prevent others from opening it. The simplest lock on the door is the latch. In ancient China, there were stone locks without keys, which were tied with ropes or chains. During the Shang and Zhou Dynasties, the private ownership of the means of production further developed, the gap between the rich and the poor further intensified, and social contradictions were very prominent. At the same time, the smelting technology is mature and immediately applied to the lock-making industry.

There are copper locks and iron locks that can only be opened with keys, and different locks are equipped with different keys. With the rapid development of science and technology, mechanical locks have made great progress. Modern mechanical locks have a history of 100 years. Marbles with different lengths are added to the lock core, and the shape should be opened with the corresponding toothed key.

Later, it developed into password lock, electromagnetic lock, electronic lock, laser lock and so on. On the basis of traditional keys, one or more groups of passwords, different magnetic fields, different light beams and waves, and different images are added. Such as fingerprint, fundus retina, etc. ).