A cooking appliance (100) comprising a base member (2), an upper member (3) and a cooking chamber (4) defined between the base member (2) and the upper member (3), wherein the upper member (3) is displaceable between a closed position, in which the upper member (3) is closed on the base member (2) and access to the cooking chamber (4) is prevented, and an open position, in which access to the cooking chamber (4) is permitted. The cooking appliance (100) comprises a locking device (1) displaceable from a locking condition, in which it prevents the upper member (3) from being displaced from the closed position to the open position, and an unlocking condition in which it allows the upper member (3) to be displaced from the closed position to the open position. The cooking appliance (100) comprises an automatic actuating device (12) for automatically taking the locking device (1) in the unlocking condition upon a predetermined condition is reached, and a further manual actuating device (13) for manually taking the locking device (1) in the unlocking condition.