I agree with Gidget on the mud snake. If it was 5 feet it wasn't a scarlet snake which is a maximum of like 32 inches. It was probably an Eastern Mud snake, which even if handled would probably not bite. They can reach lengths of over 6 feet.
Regarding the Red on Black, friend of Jack... I've alays got that mixed up, "...kill Jack etc." I just know that a coral snake begins with a 'black' face or head whereas the ones colored like it, do not.
I've seen a few coral snakes in the wild, all over in the Ocala Florida area. They are small and ultra beautiful snakes, seen mostly at dawn or dusk, and getting bitten from one is extremely rare. They almost have to chew into you, plus they are very docile.
But the snake you saw was, as stated, probably an eastern mud snake if it was as described.