I suspected this but never knew it

From "hellomynameisscott"

Did you know that most “close door” buttons on elevators don’t work?

It’s true – they’re called placebo buttons.

They’ve been around since the Americans with Disabilities Act was passed about twenty years ago. And according to the act’s homepage, the button is there for workers and emergency personnel to use, and it only works with a key.

Also, according to the Otis Elevator Company, most door close buttons can't override the minimum required amount of time doors can stay open. Whether or not you press the buttons, the doors will eventually close.

THE QUESTION IS: Why the dummy buttons?

I read a fascinating article on You Are Not So Smart that cleared things up:

“Non-functioning mechanisms like this are called placebo buttons, and they’re everywhere. If you do press the buttons, and later the doors close, a little spurt of happiness will cascade through your brain. Your behaviour was just reinforced. You will keep pressing the button in the future, even though any direct benefit from them is only imagined.”

WHICH MEANS: The buttons do work, just not for the elevators.

Their real function is to preserve people’s sense of control.

Here’s why that matters.

In the psychology manual, The Handbook of Competence and Motivation, their research proved that human beings operate out of a model to feel autonomous and in control of their environment and actions. Thus: The feeling of being in control is a basic human need.