The installation of kiosks by McD is a red herring for those opposing the minimum wage. McD was going to do it anyway. It just makes too much sense to enter orders using a screen rather than having an employee do the same for a customer.
Regarding your objections to increasing the minimum wage, it's easy to say "I know somebody who said...". The restaurant biz is incredibly difficult and I'm sure that there were other factors that led to her decision to step out of the game. It sounds like she's bitter-- her $20 burger comment is off the rails. Denmark has a $20/hr minimum wage and a McD burger there sells for about 50 cents more than in the US, where the minimum wage now stands at about $7.25. Just saying that there is a lot more rhetoric around this subject than reality.
The effect of minimum wage on employment and wages is mostly an academic theoretical topic. Very little hard data exists. The right uses some really old and disproven theory that claims jobs will disappear. Studies have never shown this to be true, most notably one by the Congressional Budget Office
http://cbo.gov/sites/default/files/cbofiles/attachments/44995-MinimumWage.pdf
Seattle is staging wage hikes to eventually reach $15. This is a real world situation that has drawn ire and attention from the conservative right who pounce on every little statement as "proof" of a disaster. The experiment is in its early stages and in fact not an Armageddon nor a paradise for workers in the lower wage brackets. A pizza operation closing down made national headlines in the right wing bloggosphere. I'm not belittling a small business owner for closing but don't understand why her operation couldn't make it while most businesses are doing fine through the transition. A study on Seattle area grocery stores showed very small effect if any on prices compared to stores outside of the Seattle area who aren't affected by the wage hikes. Seattle is doing a good job of documenting the effects of this increase. They are only one year into the real world trial and so far, hopes by right wingers of disaster are met with disappointment on their part.
https://evans.uw.edu/sites/default/files/HOvIV 1-27-16.pdf