It is still unclear.
Are you asking if the employer is required to make overtime available and allow employees to work it? If so, you have been told incorrectly. There is no such law. No employer, in any state, is required to provide overtime hours and overtime work unless there is a bona fide contract or CBA that specifically says otherwise. It is quite legal, in all 50 states, for an employer to manage the employees' time so that they never work over 40 hours and never work overtime. There is NO requirement in labor related jobs or any other jobs that overtime be made available. Ever.
Or, are you asking whether or not it is mandatory that an employee be paid time and a half if they do work overtime? If that is what you are asking, yes, a non-exempt employee must be paid overtime IF they work it.