K12 Boot Won’t Open?

I’ve been the proud owner of a 2005 Nissan Micra K12 for over a year now but in the last couple of months the boot has been really temperamental. Sometimes it opens, but more often than not it doesn’t. Has anyone else had this problem? How do I fix it? When I took it for it’s MOT last month, the garage couldn’t look at it as it wouldn’t open and I haven’t been able to open it since.
 
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