In CS:GO/CS2, you open doors or break them.
In TF2, there are no manual doors only automated gates, spawn doors.
In HL/CSS, there are doors that get you stuck.
In GMod, doors don’t exist. (Sandbox maps that shipped with GM)
In CoF, there is doors but they lead to dramatic sequences

But in Left 4 Dead 1, there are doors, and in its sequel Left 4 Dead 2, there are doors, including that one door that is locked, to unlock you must to give the lazy man soda.

"That’s all… for now. But doors have a way of opening… and closing… when you least expect." – G-Man