Walkers Wheel Chair I Would Like To Know Is It Legal For The Restroom On The First Floor Be Locked In A Senior Building?

I would like to know is it legal for the restroom on the first floor be locked in a senior building? - walkers wheel chair

Good day to do, be a main building and tenants are in wheelchairs and walkers R to go to get the key to a security office, but some tenants have to go this time.