Hard to believe that below freezing temps haven't gotten their attention, yet. Cut the leaves off, and in 3-4 days the stubs should fall off or can be brushed off. Store them inside. If the storage temp is cool enough, it shouldn't take too long to finish dormancy, I would.
In mild years, here, some of the old leaves persist well in to spring, esp on smaller plants that are always more reluctant to give up their leaves.