Automatic door systems
Most people come in contact with some form of self-powered doorways on a daily basis. Untrained usage of most door systems occurs without much conscious thought on the part of the user. The assumption upon encountering an opening with a door blocking your path is that it will either open by itself or you will have to push or pull upon the door handle to gain passage to the area you wish to access. Interactions with doors of all types are common to most people, and basic quick evaluations of most doorways are generally instantly made by the user.
The first logical reaction when approaching a door is that I will need to enter the building by passing through the doorway. My expectation is that this doorway is either automated or non-automatic because I have seen this type of door in many other locations during my lifetime. I have a stored sub conscious memory based upon my experiences from previous encounters with doorways that certain characteristics of appearance have specific related motive possibilities.
Secondly, I can determine and expect how the door should react to my approach. If no automatic doors are detected when I am within a few feet of the door then I make the quick determination that the door will require my physical exertion to operate and move through it.
Once either of these two options is determined I, as the user, understand my obligations to gain access to the desired area.