If the oil pump goes out will it lock up the motor until changed

It will not lick up anything usually, but you must not drive an engine without oil pressure! You will destroy the whole thing.

Your motor relies on the oil pump to maintain all the journal bearings of critical components during operation. If this oil supply is lost, metal to metal contact occurs and the bearings throughout your engine could become damaged. In some cases the damage is so severe that the two moving parts essentially weld themselves together, leading to a seized (locked up) engine. In this case, the engine will not magically break free if the oil pump is replaced. Other components will have to be inspected and replaced throughout the engine to become fully functional again.