As someone else here said, apparently In-N-Out was already paying $20/hr, they may have just used this opportunity to increase prices because everyone else is doing it as well.
The biggest leap was at a Burger King, where a Texas Double Whopper meal cost $15.09 on March 29 but surged to $16.89 on April 1, a whopping increase of $1.80 (nearly 12%) for the same meal.
The Big Fish meal also jumped from $7.49 on the menu before April 1 to $11.49 after — an increase of $4 (53%).
As someone else here said, apparently In-N-Out was already paying $20/hr, they may have just used this opportunity to increase prices because everyone else is doing it as well.
Other restaurants apparently saw much steeper increases: