The code for Floor 5 (4) on the keypad is: >>> 12AB <<< Enter this after it says that the floor is restricted. Use the panel buttons on the left to call the lift to a floor, interact with the doors or ring the emergency alarm. To use a callstation to call the lift from outside, click a call panel (don't worry about precisely clicking the call button) to zoom into the callstation, where you can call the elevator. Click the "Exterior" button to remove the shaft walls, so you can see the lift's workings.
