If you are asked to work overtime without compensation, it is important to communicate your concerns with your employer or supervisor. You can politely inquire about the company's policy on overtime compensation and if there are any alternatives, such as time off in lieu or additional compensation. It is also advisable to keep a record of the hours worked to ensure accurate compensation. If the situation persists and you are not satisfied with the response, you may consider seeking advice from a labor union or legal counsel to understand your rights and options.