A lock comprises a rotary latch (10) with a pre-latch position (12) and a main latch position (11), the latch being retained by a catch (20). A combined, power-driven closing and opening aid ensures an increased comfort when closing or opening the door by means of two drive elements (50, 60) that can be moved simultaneously, namely a closing element (50) and an opening element (60). In order to obtain a compact lock, both drive elements (50, 60) are arranged on a common drive wheel (40) with a mutual axial offset. Moreover, the closing element (50) is movable relative to the opening element (60) in two rotation planes which are axially offset relative to one another. A carrier (14) is also provided on the rotary latch (10), in the plane of the closing element (50), while the catch (20) has a release finger (23) arranged in the plane of the opening element. The opening element (60) is resiliently received in the drive wheel (40) and can be automatically moved between a retracted position and an extended position.