Create an electronic lock (perhaps door lock) which does not require batteries or be connected to electrical mains. Instead, power is supplied each time by the person operating it: pull a lever or turn a crank to generate electricity. Even better, step up onto a platform which descends due to your weight, generating electricity. 6 inch * 100 lb = 68 joules = 6.8 seconds * 10 watt which seems plenty for operating a lock.
Ideally we would like reliability and ease of repairs / cost of ownership comparable or better than a fully mechanical lock.
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