A turnstile can be used for paid access ( sometimes called a faregate when used for this ) . For example , it can be used in public transport as a ticket barrier or at a pay toilet . Thus a turnstile can be used in the case of paid access ( sometimes called a faregate when used for this purpose ) , for example public transport as a ticket barrier or a pay toilet , or to restrict access to authorized people , for example in the lobby of an office building .