Well, yeah, their usually will be a maintenance employee (although not on all shifts). And if the store runs lean on staff, that maintenance employee may pull other duties as needed (even cooking or register, if they’ve got the training from holding other positions prior).
Of course, these stores are franchised, so what is generally true may not be true for any specific store. I only brought it up because I think most people who don’t have experience in the industry probably don’t realize that the people who feed them are also the people who clean up before, during, and after (and not just in fast food).