Comment by apitman
"Trust this device" is the modern day elevator door close button.
"Trust this device" is the modern day elevator door close button.
On US elevators there is a minimum open duration to accommodate the handicapped or disabled. The door close button can’t force the door closed any faster.
Then most set the auto-close duration equal to this minimum open duration and you get this appearance of buttons doing nothing.
I've found that it's only american elevator door close buttons that don't work.
The rest of the world manages to keep them operational.