All public service corporations doing business within this state are required to pay their employees at least semimonthly the wages earned by them to within 15 days of the date of such payment, unless prevented by inevitable casualty. Such wages less any voluntarily authorized payroll deduction set out in section 181.06 shall be paid in cash, or by checks convertible into cash at full face value thereof, without any service, exchange, discount, float, or other charges, at a bank designated by such public service corporation located in any city in which the employee to whom the check is issued is employed or into which such employee is required to go in the performance of work for the company issuing the same. It shall be the duty of the corporation to make necessary arrangements with a bank for the cashing of these checks without such charges, or to reimburse any employee who has paid such charges upon request. When an employee shall be discharged wages shall be paid at the time of discharge or whenever the employee shall demand the same thereafter; allowing a reasonable time within which to compute wages due and to make authorized and other deductions required by law.