faulty 2003 ZX5 hatch latch

The hatch on my 2003 ZX5 won't catch. I had this problem once before, but a mechanic fixed it in about five seconds. Only problem is, he didn't show me how.
I know there's a recall, but it was for the rear doors, not the hatch. I've had problems with the hatch for a while, usually just with excessive rattling noise, but also with the not closing properly. Is there a quick fix for this, or is this going to come out of my pocket?
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