I've seen (and built) similar things on top of Twilio before. Even set it up to have multiple passcodes for different friends, then it will text me "John just l

I've seen (and built) similar things on top of Twilio before. Even set it up to have multiple passcodes for different friends, then it will text me "John just let himself in." Some people don't get the pain point, but it's definitely nice!