I agree with Alex. You should be able to extract and then consume it or feed it back to the bees as you see fit. They'll clean up any granulated sugar left behind, and any granulated sugar that comes out can be redissolved by heating.
If you can't turn the key to extract, you might try placing the super above an inner cover and see if they'll move the honey down on their own. They don't seem to like having a lot of barriers between the brood nest and their stores.
If that doesn't work, then maybe try what Vicky suggested and leave them out to be robbed, maybe scraping a few cappings off first to get them interested. Just put the frames several yards from the hives to reduce the chance of setting off a robbing frenzy.
As to why the honey granulated, the
flower type probably played a role as Vicky said, but also it may have gotten cold over winter and honey granulates faster in the fridge than at room temperature.
Regardless, honey crystallizes sometimes, in the jar or in the comb, nothing to worry about.
