Quite often in lucid dreams i knock for for my friends or hot people i know, a good way of summoning people this. and quite often the door opens when i knock it as if the door was not closed properly Wtf

Im not sure how much of you knock for people/friends in the first place but for those of you who do does this ever happen at all? Why does it happen?

For some reason this really bothers me!

Any replies welcome.