Warehouse - how to go to locked room on 1st floor

[AAA11111]

First, go to the control room on the first floor. ( u'll start ground floor)
There r four cabinets next to the poster on the inside wall.
In front of the rightmost cabinet, stack 5 and 2 boxes to climb up, then follow the iron structure.
Then break the vent and enter.

[moguracco]

thx!

[Tighron]

If you have unlocked the stepladder in the skill that also works.