I used to work in an old office building with a long wait and where the 'close' button did not seem to do anything, but pushing and releasing the 'open' button

I used to work in an old office building with a long wait and where the 'close' button did not seem to do anything, but pushing and releasing the 'open' button would cause the doors to open to their full extent and then immediately begin closing, regardless of how long the doors had been open. Thus, it functioned as a 'close' button. I did not see it being abused, but I don't know if many people had found out about it. I did not use it unless the lobby was empty of people heading for the elevators.