I see this type of #UX mistake all the time. People use a control in the wrong location and have to create high energy signs to 'fix it'.
The first image has the button effectively behind you vs the normal placement of having it next to you. This one physical layout difference makes the signage so much simpler and intuitive.

Alternative version with a simple "push button for" with an arrow

Photo of a street lamp with 2 crosswalk buttons, each with a large sign "push button wait for walk signal"