I've sorted my boot out early this year, I had it not fully unlatch in hot weather. This was the actuator getting 'lazy' and then had the problem of not catching when shutting the lid.
This was the Catch that needed replacing.
If you close the boot lid & it just bounces off the stop rather than catch then sounds like you need a new catch on there.
That is dead easy to change as you can do it without removing the whole boot trim, just pull off the bottom edge enough to get a socket in there to remove the catch.
The only problem I had was removing the thick plastic trim cover that sits over the catch, if I remember rightly I carefully inserted a flat screwdriver and sprayed wd40 in to loosen it & it came off