Actually, you may have missed it, Erevan rolled again for the lock, with disadvantage AND got really high rolls! I would say he basically went on ahead without me even being able to find a way to help.
As for being able to assist, I would leave it up to DM's call. In this case, I would have voted against it, because it is just too tight a space for someone to be of any help, but I thought I would ask anyway.