When you have Pierre, you don't need keys
Open any type of door with just one keycard. You can choose your type of RFID (radio-frequency identification) tag - wristband, key tag, pocket tag - what works best for you, and without additional keys, use it for entering all the doors.
Also, you can set, for example, that Pierre allows the entry of authenticated personnel to some secure spaces. You can also remotely give someone access, and afterward rewoke this permission.