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The daytime and night-time puzzle took little effort, but lock to the servants' quarters requires more thought. Start the puzzle by clicking on the valve to the right of the clock. Set the clock hand of the clock so the time reads 9:30. Use the bottle opener on the cap of the purple bottle. Rotate the bottle until the liquid falls down into the next container. Light the flame under the container by moving the wind up car.
The heated water runs down the pipe and into the bathtub on the screen. Click on the top of the bicycle pump to inflate the balloon. When the balloon rises high enough, it reveals a valve. Click on the valve.