In my experience - admittedly, I haven't been keeping detailed notes - 99.9% of the elevator close buttons that I have pushed have done absolutely nothing: the doors just wait the default interval before closing. The open buttons always stop the doors closing, but the close buttons: no response. Perhaps it's country specific, or company specific. But most people know this, and don't press them. The button is irrelevant and ignored. Unfortunately, the same can't be said about airport security: irrelevant but unfortunately cannot be ignored.