Fun fact for people having trouble: since Ari doesn't show up until Night 4, nothing really prevents you from just keeping the security doors shut the whole time for Nights 1-3. They don't automatically open at zero sanity like in the previous builds.
Sure you won't be able to hear anything except your own breathing, but if you just fix stuff on the camera as they break and check the office occasionally for the bomb doll, there's no real risk of a game over.