Every employer, subject to the provisions of this subchapter or of any regulation or order issued thereunder, shall keep a true and accurate record of the hours worked by each employee and of the wages paid to him or her and shall furnish to the Commissioner upon demand a sworn statement of the same. Such records shall be open to inspection by the Commissioner, his or her deputy, or any authorized agent of the Department at any reasonable time. Every employer subject to the provisions of this subchapter or of any regulation or order issued under the provisions thereof shall keep a copy of them posted in a conspicuous place in the area where employees are employed. The Commissioner shall furnish copies of such orders and regulations to employers without charge.