Not the commenter you replied to, but these kinds of systems are usually “fail open”: if there is unexpected loss of power, all applicable doors are released/unlocked.
Some more complex systems will have specific doors automatically shut in the event of a fire to try and keep it contained, depending on local regulations
TimeSquirrel@kbin.social 4 months ago
If the door has no means of mechanical egress, for example, a maglock, then it is required to have a second form of egress that cuts power to the maglock, such as a normally-closed exit button.