With some fancy scripting, it would be possible to allow the player to close the door and LOCK it, preventing the zombies from openning it.
It's all about what you're looking to do. If you want to have the player put something in front of the door, you can simply remodel the door to include a dresser or something alongside it (say along the wall it's attached to) and give it animation where the dresser falls in front of the door. With that animation you can then script the door to permanently lock after it's played that animation.
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