I believe that a good number are not even qualified for that in the end. If papers are time sensitive, based on the quantity of homework not handed in, they will never be completed when they should be. This will eventually lead to delays in tasks that need to be completed, and those with intelligence and skills in organisation will be handed the work the others have left unfinished.
Instead allow them to work in even more menial jobs. Shops always need keepers, and it is less an issue for larger shops to miss one person when the manager has things in hand to begin with.