Why not try a “Bluetooth” operated relay switch?
See eBay item number:324634081959., if not this one there must be a similar possibility.
Prrhaps eBay item number:264936220145
No keys, just your phone perhaps?
Certainly there appears to be a suitable APP for apple products that should operate a relay.
iPhone might be a bit more of a problem.
So who doesn’t have their phone with them?

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