What would cause a vehicle to start itself, it does not have a electric button start thingthing

What is your question?

3 hrs. After I parked it, with keys in my pocket my 98 Ford expedition 5.4l 4X4 started itself. After it started itself it continued to engage the starter as if I was still trying to turn the key, which I wasn't

What makes this problem better or worse?

Won't even start now

How long has your 1998 Ford Expedition had this problem?

Started that one day and nothing sincesince