Kwikset 925 Kevo single cylinder Bluetooth enabled smart lock deadbolt for iPhone 4S and 5 lets you open your door with nothing but your finger.
This smartphone enabled household lock uses Bluetooth 4.0 and an iPhone app to know when you've approached the door. This connectivity allows you to open with just a touch of your finger - not even needing to pull your phone, or a key, from your pocket.
The Kwikset 925 Kevo smart lock also comes with a fob that works in the same manner and of course a set of two traditional keys (for when you're feeling old-school).