1) Like some elevators 
The type of operation in which the customer/user is exposed to merchandise (browsing and self-selection) without assistance, unless customer/user seeks assistance.
Self service is the practice of serving oneself, usually when purchasing items. Common examples include many gas stations, where the customer pumps their own gas rather than have an attendant do it (full service is required by law in New Jersey, Oregon, and Richmond, British Columbia but is the exception rather than the rule elsewhere). Automatic ...
A retail store with few service employees to assist customers other than at the checkout. 
[adj] - of or denoting an establishment (a restaurant or shop etc.) where customers serve themselves 2. [n] - the practice of serving yourself (as in a grocery or cafeteria)
adjective of or denoting an establishment (a restaurant or shop etc.) where customers serve themselves