Automatic opening doors but they don’t open by a proximity sensor, they open when you press the button.

I think it would be cool to have a hybrid system where you can wave/nod/bow to a sensor to activate it, but also implement an open standard frequency that can trigger it so people with reduced mobility can mount a transmitter on a wheelchair/cane etc. or just use their cellphone. Would eliminate having any external equipment that would be exposed to weather or vandalism and is one less common surface for the public to have to touch.