Restaurant owners aren’t rich. Many of them were forced out of business during Covid, and most of those that survived are barely hanging on.
They cannot afford to pay their workers more than the going wage, and in most cases the going wage is far below minimum wage. If you force them to pay minimum wage they will go out of business and the only restaurants left will be chains owned by corporations.
And this is the reality for many small businesses. If you want to shut them down, by all means go ahead and attempt to enforce legal wages. It will cost you billions and wreck the economy, but hey the laws will have been upheld!