That only works when we have food to feed everyone ... which requires a surprising amount of people to stay at work. Besides the obvious people working in the fields/farms, there's a lot of support businesses that need to stay open. The people who repairs the tractors, the people who make parts for the feeders in the barns, etc, which need support for their own manufacturing equipment.

We can't just "shut it all down" worldwide and not run out of food.