Last week's episode, Ask This Old House, had something similar. They swapped a normal front door lock/handle with a Bluetooth (or WiFi) controlled unit. The phone could be used with an optional WiFi extender. My head swirled with so many scenarios where things could be bad.

1) Leave the phone in the home, you'll never be able to get in! 2) Wireshark the WiFi 3) Hijack the signal

I'm sure the dark side is waiting for us all to adopt IoT in our homes. I prefer my mechanical locks, thank you.