Don't be ridiculous. Real alternatives would include P2P between your smart lock and your phone app or a locally hosted hub device which controls all home automation/IoT, instead of a cloud. If the Internet can still route a "unlock" message from your phone to your lock, why do you require a cloud for it to work?
Or use one of the boxes with combination lock that you can screw onto your wall for holding a physical key. Some are even recommended by insurance companies.
