I like to think I'm reasonably well-traveled, and I've never seen an elevator NOT do that. However, I think you might be correct about transit systems, where t

I like to think I'm reasonably well-traveled, and I've never seen an elevator NOT do that. However, I think you might be correct about transit systems, where the blocked doors might re-open a small amount before quickly attempting to re-close, to keep the train on schedule and prevent this behavior.