Credit to @I_Like_Props: Original Guide For the original.
Place your prop (preferably a barrier) with two zones. Change zones’ size to your needs.
Wire them, the side that you enter, hide the prop, the side you leave, show prop.
Enjoy your automatic door! It should look similar to this.
this has already been made
This has been made, like a lot. I suggest searching for guides before spending a lot of time and work making one that already exist. So please mark a solution to close this.
Sorry, my bad, I’ll close it.
Your good, next time just search. 
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