Three things, one they are already automating so wages don't have anything to do with it.

two, I love how you're carrying water and claiming they'd need to raise prices by 100% to cover a higher wage, when the CEO doesn't have share concern.

https://www.restaurantdive.com/news/mcdonalds-ceo-chain-will...

and three in Australia where the minimum wage is nearly $20 an hour, the food prices are only a little higher.

https://www.aussieprices.com.au/mcdonalds-prices/

so your concern is proven by the CEO of the company and reality to be nonsense.