Put a heating pad near enough to the hole so he'll sense the warmth, but far enough (at least his body length away) so he has to come all the way out to reach it.
Then try not to watch constantly but check quietly every so often...leave the room dark, use a small flashlight when you check. It would be better to use a heating PAD, NOT a heatlamp, since BPs feel safer in the dark. You can use a human heating pad like they sell in drugstores if you have one.
That's encouraging that he's peeked out for you...don't give up. Snakes feel safer when they can hide...they are both predator AND prey. Another thing you could do
is create a tunnel out of maybe corrugated cardboard, so that when he comes out of the hole, he can crawl thru the tunnel to get to the warming pad...so he never feels
exposed.
Be sure to regulate the heat so it's not too hot, not over 90*. And instead of a tunnel, if you have a thick branch, or even a rolled up towel that he could creep along
next to, that might help him feel bolder to come out.
IF you find him halfway out, DO NOT PULL him out, you can cause serious internal injuries & dislocations by pulling on a snake's body...be Patient! Good luck...
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