Complying with the Americans with Disabilities Act
The ADA may apply to any business or public facility. Among many other things, the ADA may dictate certain features of your doors, locks, and door closers. Updating old hardware to ADA-compliant hardware may entitle business owners to additional tax deductions and credits. A good summary of door regulations can be found here. More comprehensive information can be found on the Americans with Disabilities site.
When it comes to doors and door hardware, be sure you are compliant with the Americans with Disabilities Act as well as applicable fire and life safety codes. The main purpose of locks is to secure property, but protecting people is just as important. The ADA and fire codes ensure both safety and security are achieved, not one at the expense of the other.