An employer can’t pay you less than the minimum wage for each hour you work. For example, say that  your employment agreement says you will earn $25 an hour and you’ll work 40 hours each week. Normally, you would be paid $1,000 before tax. However, if you work 55 hours, your pay should be 55 x $25, or $1,375 before tax. If they only pay you $1,000, your actual wage is only $18 an hour, which is less than the minimum wage, and this is illegal. 

Your employer also must pay you the hourly wage written on your visa (which will also be the wage on your employment agreement). If they don’t pay you this wage, you could have a valid claim for both breach of your employment agreement, and a breach of the Minimum Wage Act.

If you are paid an annual salary, you may not be able to claim wages for every hour you work. However, if your salary works out to be less than the minimum wage for the number of hours you work, you can claim for payment of the minimum wage for all the hours you have worked.