I left my key on the door yesterday. It took about two hours. Do I need to change the lock?

Just to be on the safe side, change to a practical one.

The ancient Romans wore robes and were not allowed to make bags according to the custom at that time. In order to prevent the key from being lost when going out, a ring key was made and worn on the finger like a ring after going out, which is both safe and beautiful.

100 years ago, many hotels in the United States had a special key called "honeymoon key", which was specially prepared for newlyweds to spend their honeymoon. The couple must insert the key into the keyhole at the same time before the door can be opened.

key

Keys were invented later than locks. The ancient Egyptians were the first people to use keys in the world. Their lock is to insert a wooden latch into a groove with a wooden latch at the top of the groove. After the door bolt is inserted into the groove, the wooden bolt will be inserted into the hole of the door bolt. In this way, the door bolt is very strong and must be opened with a key.

Because the Egyptian lock can only be used on the side with the bolt, which is not conducive to flexible opening and closing, the Greeks developed a lock that can be opened from the other side. The key made by the Greeks is a curved wooden stick, which is very similar in shape and size to the sickle used by farmers. However, some keys are as long as 3 feet and must be carried on the shoulder to move, which is quite heavy.