From what i remember, may have changed, when Freddy laughs she moves, and you only need to close the door when she is in the hallway (or something similar, sorry its been a while)
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you can't (or i'm noob), but you can see her before hallway. If you see her on the 6 camera (right door), left camera on her, close door after 10-15 second after her laugh (or this time after you spot her), switch camera to any camera except cam6, and pray to God that she will laugh again which mean you can open door. I think Freddy can't attack when your camera on her, i read this from comms.
My english not so good but i tryed to explain my strategy, i almost beat night 6 but foxy come to me 5 times in 1 run (and she just ate my last 14% energy) :((
But with freddy this strategy works good. Except the RNG part of Foxy if you won't check her (when you trying to throw out Freddy and your camera is busy)
Edit: I BEAT NIGHT 6 (УРААААААА!! Победа.)
i think this strat is working