The first locks are known to have appeared as early as ancient Babylon and Egypt. That's over 6 thousand years ago! They were actually once made of wood and would use a toothbrush-shaped key. Now of course there were downsides such as the weight of the key, but you have to admit, for its time, its quite impressive!
citation:
"History of Keys - Who Invented Keys?" historyofkeys.com, www.historyofkeys.com/keys-history/history-of-keys/.
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