Think about this for a moment. If you make everyone millionaires, all you end up doing is devaluating your currency. In fact, the same can be said of raising minimum wage. Everything ends up being more expensive because employers then need to pay everyone higher salaries.
So when should you get a raise? When you provide added value to their employers… not just because they've sat in a chair pushing the same button for a long time.
If you can help, contribute and help your employer build their business and make more money, why wouldn't they be delighted to pay you more? If not, it might be time to go help someone else build their business and make more money.