Nope. You cannot get stuck. In 4000 years of recorded hypnosis history, the only one who has ever gotten stuck is that guy in the movie "Office Space" and to be fair, he kind of needed it. In that movie, the hypnotist dies of a heart-attack while his client is hypnotized and for the rest of the movie, the client is still in trance and ultra-relaxed.
In reality, what would happen is that the client would come out of trance and try to help the dying hypnotist or he would fall into a deep, relaxing sleep and awake naturally, then try to help the already dead hypnotist. There is no 'stuck'.
I'll let you in on a secret. If people could get stuck, we hypnotists would create armies of "hypnozombies" to do our bidding for us, while we lived lives of luxury and pleasure. Muahhahahahahha! Just kidding. (Or am I?). Nope, No stuck. Instead, we try to help people.