For a landlord, a lock is not a gadget. It is the end of meeting a tenant at 11 pm to hand over a key.
What a one-time code solves
Cleaners, guests, viewings, deliveries. A code valid for two hours and one entry removes the key handover entirely, and the access log proves when it was used.
What to check before promising it
Does the code work offline? If it requires the cloud, a basement flat with poor signal will fail at the worst moment. Local generation with time-window validation is the reliable design.
The management side
The landlord needs to see history per code and revoke access instantly. That is a property-management requirement, not a lock feature.
Where this sells
Short-let apartments, serviced offices and any building with a reception that should not hold keys.
Takeaway
Sell the hour saved, not the algorithm.