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@Brun search for Friction Latch and you'll see lots of examples. Such as the below. You just have to make sure the male part lines up with the female part (giggles) and when you push them together it'll hold. We have them on our loft hatch and they're solid.
The one we have doesn't have the same screw holes on the female part though. The ones we have, have them on the bottom section rather than the side sections, if that makes sense.
Or you could go down the roller catch route if you wanted something a little stronger.