Right now you can’t walk through the same door at (nearly) the same time. If you’re trying to go through a door with 4 people, it takes roughly 10 seconds before the 4th player can go through.
If you want to have some delay for “realism”, I would firstly ask you to reconsider, and secondly reduce that delay to something like 0.2 seconds. In real life you can go through doors more efficiently than in Sacrament 