How do you fix a car trunk that won't close?

My 2004 Chevy Cavalier's trunk door won't close. My husband puts loads of things into it, and it has only done this once before. I drove a little ways down the road, stopped to get something in the store, and when I came out, unlocked my car door, the trunk came open and now it's like the lock won't latch. Can anyone please tell me what's wrong and how to fix it? I don't have the money to take it to a body shop, and my husband is rather useless in that department.
 
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