its happened to me several times that when i disconect the battery it kept the key in the if the key was on anything other than of at the time the battery was disconnected.
try what the other have suggested.
from what i am understanding is that your battery is not dead and the car works just fine, its just that the key wont release. heres something else to think about. It might be that the shifter thing that sends the shifter position is malfunctioning. Try disconecting the battery and then reconnecting it in an attempt to "clear its head", dont know if that will work.
Also try moving the wheel, you know how it wont let you turn the key to ignition if the wheel is locked, maybe the opposite is happening to you. Dont know if the H3 locks the wheel but try.
other wise take it to dealer as soon as possible, and make sure you keep an eye on the truck when you leave it parked somewhere with the key in the ignition, otherwise its a free ride.
