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But that incident got me thinking: why don’t house doors also unlock via Bluetooth instead of having to fiddle them with a key, which is what, at least a 500 year old technology?

It exists; try Amazon... . They have door locks that work with WiFi, Bluetooth, and (as we have) pushbutton locks.

Thanks for the info. Now I change the goalposts. Doors should not only unlock, but open and close themselves for you. Handsfree. No doorknob twist, no code punching, no fingerprint-reading. Because usually I am carrying stuff in both hands as I enter or exit. Handsfree is what I want.

Like when we walk into a store, the glass doors detect a human approaching and open for him handsfree, then close again handsfree. Combine that with the ability to securely ID 'him' and only let him pass if authorized.

With a pin punchcode on one door somewhere as backup in case power fails.
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