The door to

Hi everyone,

The following is a passage from the book I'm reading
(Context: a young boy comes home early, hears laughter upstairs, quietly goes to open his mother's bedroom door and finds her in bed with another man than his father.)

- I opened the door and saw them there [...]. No-one spoke. Three people and no-one spoke. I pulled the door to. I slammed it, I think. I turned and started running [...].

I don't understand what to is doing in there. Is it elliptical for "the door to the bedroom"? For "I pulled the door to me"?
Can you help me?

Thanks
H.