Snakes don't like cold weather. They will find a hiding spot to sleep in. It looks like yours has found a good one. Next time you see it away from the burrow, SLOWLY lower a small weight (like a washer) attached to a string, to see how deep it is. If it's not too deep you could just fill the hole back up, and your snake will find a different hiding place. If it's deep, it might be a nest and you'd be killing some of the most awesome "natural garden pets" in Florida. If that's the case, wait til spring, and see if the babies come out. If they don't you can just fill in the hole when dad (or mama) is out for the day. If they do, well - they're not in there anymore, so you can fill in the hole.
Black snakes are excellent. But yeah you won't want them burrowing under the foundation of your lanai.
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