This skip saves about 8 seconds if you do it good enough. And its not that hard

1. Go to the gallery after the key broke
2. Insert the code in the safe but don't open it
3. Make your game at 6 FPS
4. Go to the gallery door and make the door open all the way and towards the safe.
5. Run to the safe and open it as fast as you can
6. Get the key and run out