The lock cylinder in the rear hatch is seized. So far I have removed the outside bar which houses the licence plate lights, hatch lever and the lock cylinder from the hatch. I have removed the retaining clip which I thought was the only thing keeping the metal lock cylinder in its plastic housing within the plastic bar.
I can't get the lock cylinder out (I assume it is pulled out forwards as it is normally oriented on the car), and will probably snap the plastic housing if I keep prying at it. Is there a trick to this?

Thanks for all any comments.