If someone who isn't me wanted to open the little service panel on the top of a coin operated laundry machine similar to the pic, how would they determine the right key, and where would they buy it?
What would they find inside the panel, and how does it work?
Take a pic of the top of the tube lock on top of the washer there and tell me the model and I'll find you the key. You'll have to fiddle around inside of that maintenance access hatch but usually you can just figure out what the coin slot pushes against and just push that thing manually to start the washer.