I know this post is a little old but worth mentioning here. Easy way to get broke key out of lock is with a small coping saw blade. Some time you may need 2 saw blades but usually one will get it out of almost any lock. Just break the end or cut the saw blade keeper which is a little round pin on the end of the blade, then insert the blade next to the broken key turn saw teeth to the key and pull out key piece. It also helps to put some lube in the key hole first I use WD 40. Have goten many keys out this way over the years.
2003 Dodge Ram 2500 5.9 Diesel
2014 Rockwood 2608WS