[solved] Stuck right bevor elevator. (given the "guy" one pair of batteries)

[Salz`]

Hi there,
i'm stuck right after giving this guy in the room after the greenhouse one pair of batteries. The hint seem to told me getting some sunflower oil. But as you know, i get the coins, so i must given the "grandpa" his sunflower oil to get into the "play house". Is it maybe related to my stupid playing with the oil-machine? I filled the can, and after that i just gave it a second try without can, and letting the oil leave the screen.

Any solutions?

btw: the door just not open up, nor is clickable.

My bad, i needed to press the key right next to the door.