At this time SkyBell does not have any direct integrations that allow you to unlock your door with the device or from the app.
One option available is using IFTTT.
SkyBell does integrate with IFTTT. This is a third party service where you can develop a "recipe" to connect different IoT devices together.
Our goal is to deliver the very best Wi-Fi doorbell and will continue to explore opportunities to integrate with other devices in the future. We are committed to security for our customers so you can trust that when we do partner with a door lock company it will be a secure connection.