I was intending on doing something like this, but this deputy economist did a fine job - breaking down the effects of a $15/hr wage on McDonald's profitability and pricing.
I'm going to explain this very succinctly and simply as possible in the vain hopes some of these McDonald's protestors are listening as it WILL help them in their financial futures:
Companies would not exist without profit. The reason why is that in order to form a company you need investors. And investors (that's you people with your 401k's and IRA's and pensions) will not part with their money unless they get something back OF HIGHER VALUE in return. In otherwords, people aren't just going to throw money away at McDonald's so they can employ people temporarily until the company runes out of money (besides, that's what Barack Obama does with the likes of Solyndra and other green-red companies).
So you can protest all you want. If you get a law passed for the $15 per hour, McDonald's will shut down those stores.
If Wal-Mart has to pay it's employees $12 per hour, Wal-Mart will shut down.
What you are experiencing and the frustration that comes with it, is the real world telling you that you do not have the skills they want. You offer nothing of value (beyond the minimum wage job) that they are willing to part with their money for.
Your real world choices are jobs that pay minimum wage or no jobs that pay $15/hr.
You also could go to school and develop a skill in which case you'll provide something of value in excess of $15/hr.
But sitting on your ass and merely existing, that's nothing special. And your wage shows it.
And don't get pissed as me. This is the real world. You either live in it or suffer. You should be thankful I'm telling you like it is.
Post script - for those McyD's employees still reading this, I want you to real through the comments. Some wise words there about basic labor market economics. You think long and hard. Do you want real world advice or just want to be lied to? Which is going to benefit you in the long run.