Yes, it is possible. You just need to monitor a specific wallet, and when that wallet receives a certain amount of sats, it sends a command to the door opening mechanism. This system will require some work, but it is not complicated.
Anyone could send sats to the wallet and open the door, as long as they know which wallet to send to.
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Perfect thank you! I see this as a great form of aplication specially when smart is easier to grab than a key
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