Quick Answer
Okay, so here's the quick version. Your door won't latch or the deadbolt won't throw because that new, fluffy weatherstripping you put in is too thick. It's like a pillow blocking the door from closing all the way. This pushes the door away from the frame just enough so the latch or bolt can't reach its home in the strike plate. Nine times out of ten, that's what's going on. You might be able to fix it yourself by trimming the foam or adjusting the strike plate. If you call a pro, you're probably looking at $100-$175 for a quick fix.
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