Step on / Elevator (button)

We remember that we had difficulty in pressing the button of an elevator because our hands were not free. We try to press it, using our shoulder, we put the cargoes down from our hands and then, press, or we ask for help. We try to use all the possible ways. If the cargoes on the hands fall down, the situation will be worse.
The button of an elevator is located on the floor so even though your hands are full, you can press the button for yourself.
The button is easy and comfortable to press for the office workers who have piles of documents on their hands, for the mothers carrying groceries, and for everyone who can't use hands freely.