put them in a damp/warm paper towel. Fold the towel and place in a ziplock bag, place the bag on top of an appliance where the heat vent is, "Monitor, stereo, cable box". This will get the temp warm and pop those babies open like pop corn, well not like pop corn but you know....

Open the bag every 3 or 4 hours to let fresh air in, you do not need to zip the bag and I leave mine open but not wideopen.