With frozen fasteners there is a proper progression. First the proper tool and hand force. Second, soak in a good penetrating oil like Kroil, etc (just the thread or slip area). Continue by applying heat if still frozen. For localized heat an old Weller Pistol Type electric soldering iron is often the trick. Hold the tip against the metal item to be heated and hold trigger down. Heat will be conducted along the part and help hasten the capillary action of the penetrating oil as well as softening the bond of any thread/stud locker.
If that fails, Vise Grip and Hammer.
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