Hi Greg, the key is a half-moon type, just give the area a good soaking with WD40 or CRC, grab a screw driver and hammer; now locate the tip of the blade low down on one end of the key and tap gently...it should slide up and out.
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl