Can an employer pay you a salary, and work you 7 days a week and at least 8 hour days?

With only rare exceptions, an employer must pay an employee at least minimum wage for all hours worked.  Unless an employee is specifically exempt from the requirement, he or she must also be paid 1.5 times his or her regular hourly rate for all hours worked over 40 in a given week.  If you believe you are not being paid correctly, you should either seek the advice of an experienced labor & employment lawyer (it may be the attorney can represent all of the employees who are not being paid correctly) or file a complaint with the U.S. Department of Labor's Wage & Hour Division.  There is an office in each major city in Texas with DFW sharing one in Arlington.