I've gone through the warehouse and the snake cult estate, but when
I get to the door to the underground crypt it won't open. Says it is
barred from the other side. Did I miss something? Can anyone tell me how to get passed these doors? Thanks

Did you kill the cult leader? If so, check around for a treasure bag. I think he may have a key, or maybe it opens automatically when he dies.

One of the rooms has a floor lever in it . Did you click on the lever?