I know you don't have a deep pocket,and win this case is extremely because those happend many times a year, so that the public defenders know very well the outcome.
My friend had to plea guilty to "disordered house"(I didn't know what really was in the Calf. penaly code for that saying) later expunged and got the greencard) But this happend 20 years ago and he got his green card about 12 years ago). His laywer who helped to expunge the record told him, this was pretty serious charge(even still a misdemeanor) Please don't say "这样的工作失误", you must treat it a life long lesson.
PM me, if you want more detailed information