Are you on Chapter 6? If so you saw King Otar do it before. Just click (with the mouse and not the shovel. Although if you didn’t play Chapter 4 you need to get the flower that’s hanging outside the grate, Click the shovel on the stone and you should get it.) Left eye, right eye, nose. The safe door looks like a face, right? So the left eye would be the left button and the right eye would be the right button and the nose would be that lever in the middle.