The Secretary of Labor or his authorized representative shall have the power and authority to enter any place of employment, place of public assembly or public building for the purpose of collecting facts and statistics relating to the employment of workers or for the purpose of making inspections to determine whether or not the labor law and laws relating to the relationship between employer and employee and the rules and regulations adopted pursuant to the provisions of this chapter are being observed. No employer or owner shall refuse to admit the Secretary of Labor or his authorized representative to his place of employment, public building, or place of public assembly for the purpose of making any reasonable inspection or impede or obstruct him in making any reasonable inspection.