98 Catera Ash Tray

My uncle just got a 98 catera. The ash tray wont lock closed. It will go back until the point that it clicks (I found out the click is just the switch for the lights), but it just wont stay shut. I have pulled it out of the dash and am looking at it right now, but I cant seem to find anything that looks broken, or out of place. Does anyone know how this thing is supposed to lock shut?

Thanks,

Rick