Unfortunately, in most areas, low-wage workers get no contract whatsoever: YOu can pretty much be fired at any time for almost any reason except for a few federally protected ones. Those are easy to work around.

I'm not sure if going over one month does anything, and it most certainly doesn't do anything in a week: Some places will schedule folks around 40 hours for a couple weeks and then nearly nothing for a week to get the average down.