How to actually turn off the lights?

As an ADHDer, I am able to finish my homework, my payments, my chores (maybe later but they are done). But small insignificant tasks at work like turning off the lights, grabbing my backpack, locking the door, seem impossible.

For context, I do not "own" my workplace, I'm an intern and I do not have a lot of "power" in the sense, I don't have my office to put up a poster like at home with a list. Please tell me your systems!