Big Mac here is $3.90 for just the sandwich, $5.12 for the meal which has fries and a medium drink.
In Denmark the burger is $4.80
The OP video just outright lies.
And the position that get's $21 an hour? It's the manager of the store and even in the US, managers are well paid.
And it makes you wonder that if OP can buy into this lie, what other lies has he bought into?