Again, Walmart can't just pay more, or McDonald's. If Walmart becomes more expensive than other stores that pay less, then Walmart goes out of business, and all those 2.2 Million people they employ, are out of work.
Is that better? Same with McDonald's. And by the way, Walmart pays more than most other places.
See, you seem to get this idea that companies have magic money trees that pay wages. They don't. Every single penny that a company has to pay employees, comes from customers.
Are you willing to pay $20 for a burger at McDonalds? Because that's what it's going to cost to pay Employees $20 an hour.
Look at Norway. McDonald's in Norway pays about $15 an hour.
That's a McDonald's menu from Norway. Notice the price. About $16 for a big mac.
That's how that works. No business can pay employees more money, than the customer is willing to pay for the product or service.
We're not going to McDs to pay $20 for a burger. Thus the McDonald's either closes, or replaces workers with robots.
Is that better? Either way, the workers are unemployed.
How much government welfare and food stamps, are they going to get when they are earning ZERO from being unemployed? Your minimum wage would make the situation much worse, not better.