USAFAN
The parking elevator to lobby transfer is a necessary security measure to check the criminals at the lobby level. For elevators with direct guest floor access we recommend to our clients to switch off the upper floor acces at night.
The electronic card key alone is not going to work, as the criminals can follow you out of the elvator. No guests would demand to see the other guests' card key before they let them follow.
Your idea of a lockable walk-in closet is an excellent idea, the best I've heard in years. Thank you.