No guarantees, but I’ve had this work with ‘stuck’ cakes: Wet some dish towels and wring out well, then heat them to steaming in the microwaves. leave one folded up on the counter and set the loaf pan on top of it. Uses the others to wrap around the sides of the pan.
NOTE: do not wrap over the top or let them touch the bread.
After a minute or so it will have liquified the shortening between the bread and the pan – assuming there is any – and you might be able to invert the pan and give it a thump or two and the bread will come out.
I tried something similar and just set the pan in 1/2 inch of hot water for a few minutes. Most of it survived, just one little patch on the bottom stuck. I smeared it back on there and wrapped the loaf in plastic. Hopefully no one will notice at the holiday party tomorrow