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Who Invented the First Key? The 4,000-Year-Old Egyptian Lock System The world’s first key wasn’t metal — it was a giant wooden key created in ancient Egypt 4,000 years ago. In this short documentary, discover how Egyptians invented the first lock-and-key mechanism, using wooden pins, wooden bolts, and oversized keys to secure homes and storage rooms. This ancient design became the foundation of the modern lock system we use today. Watch to learn a surprising piece of history hidden behind every