They are all making smart door locks, why can they turn on？

Imagine a life scene like this: you don’t need to bring a key when you go out, a fingerprint can unlock the door; the moment you go home to open the door, the smart camera automatically captures the image of opening the door, identifying "family" or "strangers"; at the same time, the air conditioner in the home , TVs, lights, speakers and other equipment automatically sense, waiting for our "send" at any time.