This could be in the next small update: A feature where the user can make doors one way or make them only for arrival/departure passengers.
Hello and welcome 
It would be of course a nice feature but sadly there is more to do than just add new objects.
The issue is, that passengers do only know what they want to do next, Like going to a restroom, a shop or a seating area. They do not check if they are able to get back to the previous area where their departure gate desk is.
So when players are going to use one way doors, they will trap their passengers or create large paths to bring them back in the correct area.
To solve that issue, the entire zone and pathfinding logic has to be changed. 
By the way, if you are looking for a way to separate arrival and departure passengers, check out that option:
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