OP, if you do want to pick the lock, here is my suggestion:
you need to level up your lockpicking skill to at least 70 or maybe 80. Don't worry about the perks, but maybe take 30% easier lockpicking potion or some enchanted lockpicking gloves and boots. You may break a few lockpicks, so be sure to carry at least 20 or so with you.
It is a Master lock, after all.