This SINK is actually a live prop and has 6 animations that can be performed.
1. Open Left door
2. Close left door
3. Open right door
4. Close right door
5. Open both doors
6. Close both doors
Remember that you can easily affect the speed of any motion by making the performance strip in the timeline longer or shorter.
Another thing that can be of interest is that if your character has something in her/his hand, you open the SINK unit and place whatever it is on a shelf.
NOW you unlink from the characters hand and in the next frame you link to the shelf in the cupboard, it will actually stay on it's place. A nice twist in real feal synthesis we always try to achieve!!
Another picture showing what it looks when the doors are open.