> "I think that this article represents the need for digital locks."

I disagree. We are talking about keys to critical infrastructure - fire doors, elevator overrides, utility areas of subway systems.

These are all resources that need to be accessible in a power outage or disaster situation. I do not want our firemen to be locked out of where they need to go because some digital lock lost power.

There is a reason in traditional engineering emergency overrides and shutoffs are mechanically implemented and don't go through a computer.