An embodiment of an electronic access control system includes an electronic key, an electronic lock, and an access control administration program. The electronic key can include program code for switching between a lock mode and a computer mode. In some embodiments, the lock mode and computer mode allow for simplified administration and operation of the access control system. Some embodiments of the electronic key include a rechargeable battery. In some embodiments, the access control system includes a hybrid power supply system having a rechargeable battery and a generator. In some embodiments, the electronic lock includes a piezoelectric latch. In some embodiments, the electronic key is configured to act as a storage device for a computer system. Some embodiments provide an electronic access control system with a streamlined user interface.