It's just one of the trend of "smart locks" on display at the Consumer Electronics Show CES that ends here Friday.
"My keys were always scratching my phone, so I thought why not build them in," said Bestard-Ribas, founder and chief executive of San Francisco startup Goji.
His creation fuses mobile Internet technology with centuries old lock mechanics. A free Goji application installed in smartphones uses Bluetooth connectivity to let the lock know a person is near and, if it is a resident or someone given a "digital key," a personalized welcome message displays and the path is opened.