That's because because unemployment is going vertical. McDonalds is turning down famous athletes, movie stars, and former presidents at this point. Seriously though, keep trying. If things get really bad and I suspect they might, volunteer to work at places for free. Ask if they need any help at all. That way if things recover and you've proven that you're a respectable person, you'll be almost guaranteed a job when the business has the money to pay you. This is an old but little known Great Depression trick. You'll likely be paid sooner rather than later because the business owner will see what a great worker you are and feel guilty.
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You create your past.