Meet the Mul-T-Lock ENTR: a smart door lock that you can control from your smartphone or tablet. It also lets you use a touchpad, fingerprint reader, or remote control to gain access to your home. ENTR is easy to install. Just remove your old door cylinder and install the device.
You will be able to create virtual keys for your door easily. You receive notifications on door status. ENTR is compatible with iOS and Android devices. The above video highlights how this smart door access system works.[Source]