Simplisafe offers a smart lock as an add on to their security system. Monthly monitoring is less than $20/month. Wifi isn’t required.
Simplisafe uses a dedicated limited cellular connection. You can have an app on your phone to control & monitor the system.
You can install & connect to monitoring a base system with a motion detector & keypad in less than 30 minutes. I installed 10 door & window entry sectors, a motion detector in less than 1.5 hours.
Currently they are running a 50% off sale.