If you can get a really long screwdriver behind the latch going up from underneath and behind the T-pipe, you should be able to tag that spring on the backside and pop the little lever. It might help to bend the tip of the screwdriver just a tiny bit so it will grab the lever from you twisting the handle.
Kind of similar to this....... https://www.youtube.com/watch?v=mCQCatoG9Rc