I hooked one up to the intercom/door unlock system at the office. Most electronics with physical pushbuttons can be disassembled and wired in with a relay for

I hooked one up to the intercom/door unlock system at the office. Most electronics with physical pushbuttons can be disassembled and wired in with a relay for control by the Pi. As usual, be very careful if you're disassembling something using AC.