There are a variety of different keyless entry devices available using smartphones or bluetooth features to unlock doors. Depending on the accessibility needs of the person the following products meet a wide variety of support needs.
Lockitron – Fits over the existing deadbolt and works with iPhone 4s and 5 to automatically unlock the door when it senses you walk up.
Kevo Lock – This lock requires some installation. Compatible with the iPhone 4s and 5 or a bluetooth fob the user is sensed by the lock and taps the lock for entry.
Goji Smart Lock – This lock requires some installation. The Goji lock fits on the outside of your door and sends a picture to your smartphone of who is at your door. Works with smartphone entry and also bluetooth fobs.