Figs not ripening.

We've had a fig tree that was here when we moved into our house four years ago. The long and short of it is that every year the tree gets full of figs but they never get very soft. We've cut a few open and they are as tough as leather. Our soil here has a lot of sand in it but the apple trees on either side of the fig tree do quite well. They are watered on a drip system every other day for 30 minutes. The area is quite shady and with the frequent fog, even in the summer time, I'm wondering if that could be affecting things.

Here are some photos:

Can any of you share some wisdom on how to help these figs ripen?

Thanks for your reply.