I've been locked out of my phone for a year, what can I do to use it again?

I'm having some trouble. My sister locked me out of my phone for a year. My windows phone is a Nokia Lumia 521 if it helps. I've tried turning it off and on but it only reduced the time once. It use to be about 2 years that I had to wait for it to unlock, now it's 612733 minutes- a little over a year. I do not want to reset my phone- I have many valuable pictures and stories in there. I've had my phone for a little over a year now. It's kind of important to me and I'd really appreciate the help. Thanks!

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