Attorney Forman is correct, although there is if course no law mandating raises except if you are paid so little that a raise in the minimum wage requires you to receive a raise as well.
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First, you are probably entitled to be paid for the unpaid overtime you worked since being hired. You should consult the NYS Dep't of Labor or an employment lawyer about your rights. Second, if you think you have been paid less than White employees, you should contact the NYS Division of Human Rights or an employment lawyer.
First, an employer is only required to pay minimum wage. There is no requirement that employees receive regular raises, or any raises at all, so long as they are always paid at least minimum wage.
Second, an employer is not required to have an employee handbook, and doing a copy & paste from another handbook is okay (though it should be conformed to make sense for your workplace). Copying & pasting can also create legal issues if the policies described don't make sense for where you work-- it's not a recommended practice, but it's not inherently improper or illegal.
If you are an hourly worker and work over 40 hours a week, they should be paying overtime. It sounds like you'd have an overtime case based on what you've written.
Also, you might have a claim to discrimination based on race if you have been treated differently on account of your race.
If you want to discuss your situation with me, feel free to give me a call.
Feel free to contact me if you want. Dan Knauth email@example.com // 212-317-1200. Answers to questions are meant to be general only, are not intended to be legal advice and do not create an attorney-client relationship. Answers to questions are based on NY law, and the laws of other states may create different rights and obligations.