Hivemind challenge 2

[NeroAngelos]

Hi there!!
I'm stuck at the second hivemind challenge where i should get through a locked but weak door and one of the zombies is walking through the corridors. i can't find anything to smash the door and every side corridor is empty...
I would be glad if anyone could tell me how i get this damn door open

Thanks for any answer that come^^

Spoiler below!

not all side corridors are empty..one has a broken pillar..