Currently at a reasonably-priced hotel in the boonies. Extended my stay the other day and they had to re-issue the keys. The keys must be aware of the reservation period, and the locks must be aware of the current wall-clock time. Finding a way to tamper with the RTC in the lock could blow up the whole system. Or, you know, a crowbar.
I'd imagine the locks in most hotels don't require an internet connection. Frankly I'd be horrified if my hotel room's locks depended on this horrendous WiFi.
