A lock assembly that includes a push button assembly manually movable from an unlocked position to a locked position, a biasing member that biases the push button assembly toward the unlocked position, and a retaining member that engages the push button assembly and a lock member to retain the push button assembly in the locked position. The lock assembly further includes an exterior handle, a driver, and a cam member coupled to the driver for rotation with the driver. The push button assembly engages the cam member to rotate the driver toward a locked position when the push button assembly moves from the unlocked position toward the locked position and the push button assembly engages the cam member to rotate the driver toward an unlocked position when the push button moves from the locked position toward the unlocked position.