Besides digital and/or online interfaces, UX can also help us to identify and fix bad experiences with more analogue interfaces, such as elevator panels.
Basically, a good design should make the user have the least doubts and think as little as possible about what procedure they should use to achieve the result they want, except where doubts are intentionally created and make sense in the context of design. For the most part, if in doubt, the design is probably not clear enough.
Look at this elevator buttons:
Now, imagine the situation: someone might have stopped and thought that in this arrangement, ...