A three-part solution.
Part One: All door locks in the building are on proximity cards.
No more massive keyrings! (40 keys? Seriously, 40 keys? What am I supposed to do with 40 keys? What do you mean, two more rings?! Isn't 40 keys enough?!)
No more duplicated, lost or stolen keys! ("I'm sorry, I think I lost my key on the bus." "Oh. Okay. I'll deactivate that one: here's a new one.")
No more needing to memorize 200 different ways to open 200 different doors. (This one needs firm pressure on the left side; this one needs you to turn the handle and pull inward as you unlock it; this one needs a hip-pop or else it won't lock; this one likes to be sweet-talked and gently massaged as Kenny G plays in the background...)
No more ancient keys snapping off in locks which haven't been oiled or maintained since the Carter administration!
No more giving master keys (or massive, ungainly key rings) to external clients!
No more keys going home with contract staff! (If they do, you can cancel the key remotely. And if you hire them back on, you can flip the key back on, too.)
No more mystery keys! ("I know it's on this ring for a reason, but I have no clue which door it opens...")
Part Two: All proximity sensors along main thoroughfares are super-convenient. Specifically:
- The sensor is sufficiently sensitive that it can read a card from within your pants pocket. (Your hands are full? Just sway your hip within ~5 inches of the sensor and it'll pick up the card.)
- The sensor is pressure-sensitive, and pressing it with a card in proximity will cause the door to open--and remain open--on its own. (Wheelchair-accessibility! No more putting stuff down to open a door! Hooray!)
- Any user can toggle the sensor in some special way and cause it to enter a "deactivated mode", leaving the door unlocked for some preset period of time.
Part Three: All proximity sensors include manual overrides which can be operated with a physical master key, just in case. The master keys are kept in the PSM or GM's office, and are only distributed in case of actual legitimate emergency.