I think you could get them stuck halfway closed by cramming something in the door frame that would get the whole thing jammed.
This was a popular griefing tactic when TF2 first came out where you could trap everyone in spawn by crouch-jumping into the spawn door as Scout: https://youtu.be/JUPzN7tp7bQ?t=243
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This was a popular griefing tactic when TF2 first came out where you could trap everyone in spawn by crouch-jumping into the spawn door as Scout: https://youtu.be/JUPzN7tp7bQ?t=243
Yeah this seems to be exactly the same issue that Valve eventually discovered in the Mastodon thread linked by OP.