Coin-operated lock comprising a lock housing (1), a lock cylinder having a cylinder core (50), a bolt piece (3), and a follower (4), which is rotatable about a rotational axis and is coupled to the cylinder core and the bolt piece to allow operation of the bolt piece by means of a key inserted in the cylinder core. In the absence of a coin inserted in the lock housing, a blocking device (6, 7) prevents movement of the bolt piece. A decoupling device is designed to decouple the blocking device. The decoupling device comprises a driver (20) and a coupling member (30). The driver is arranged radially outside the follower (4), rotatably about the rotational axis of the follower, and comprises a decoupling member (21, 22) designed to decouple the blocking device. The coupling member (30) is arranged on the follower so that it is radially displaceable between an inner position and an outer position, and comprises an inner (35) and an outer (34) end. The coupling member is designed to be displaced, upon insertion of a service key (60) in the cylinder core and upon contact between the inner end and a code surface (65) arranged on the service key, from an inner to an outer position, in which outer position the outer end can engage with the driver in order to achieve, upon rotation, decoupling of the blocking device from the bolt piece.