Okay, another concept that eludes a lot of folks these days.
Denotation, The Good Old Days: an access point, an opening with a door that swings or slides or turns to open and close the access point, to allow entrance and exit from a structure, aka a building or perhaps a room.
Connotation, Today: A place to hang out in front of in order to make sure no one can get past or through without bumping someone or saying "Excuse me," which used to be a magic expression that got people to move, but is now mostly ignored.
People of the world, or at least, those of NYC, let's all try to stick with the actual definition, okay? Thank you.