Security Door Lock

The idea:

A Walabot is placed on the wall next to a door. An Alexa Dot device is also add to the wall. The door has an electrical lock and preferable a motor to swing it open. The user places his hand to on the Walabot. The Walabot scans the size and shape of this hand. The scan is compared with a list of allowed persons (this comparison is done using a trained AI) and if approved the Alexa dot is enabled. The user says the code word and the door opens. Very Sci-Fi design but way cool :)