The warehouse itself is boarded up and appears to be abandoned, but succeeding at a DC 15 Perception check (passed) while investigating either of the sets of double doors reveals that the boarded-up appearance of the door is only a disguise - both doors are locked, but the boards nailed over each door don’t actually impede the doors’ use. The other doors are all securely boarded up; they must be smashed down or dismantled to get through them.