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The door key is inserted inside, but it can't be opened outside. What should I do?

Use sandpaper to grind off the head of the other key by two or three millimeters. Of course, grinding wheels can also be used, which is more convenient.

02

You will find that there will be metal residue on the edge after grinding. Use sandpaper to grind off the excess metal and try to polish it as smooth as possible.

03

Now insert the key and try to turn it. If it can't be opened, pull out the key while rotating, and it will be opened under normal circumstances. If it has not been opened, continue to polish the key head, grind off the excess metal, and then try to insert it and open it.