Locking device for locking a pivotably mounted door of a container, having a housing, at least one hook pivotably mounted on the housing about an axis of rotation for hooking into a retaining axis arranged on the container in the closed position, an operating handle pivotably spring-mounted on the housing about an axis of rotation for unlocking the at least one hook hooked in the closed position, wherein the axis of rotation for the at least one hook and the axis of rotation for the operating handle are arranged coaxially, the at least one hook can be actuated by the operating handle via at least one catch non-rotatably connected to the operating handle in such a way that, when the operating handle is moved via the at least one catch, the at least one hook can be moved out of the closed position, and with at least one indicator for the identification of an incompletely locked state of the door, wherein the at least one indicator for indicating an incompletely locked state of the door is arranged on at least one lateral outer surface of the operating handle and essentially perpendicular to the second axis of rotation for the operating handle, wherein the operating handle is freely movable around a predetermined angle range before the at least one hook can be unlocked and the at least one hook comprises an oblong hole for receiving the at least one catch.