SetRelativeLocation() with Lerp

This should be simple, but I might be missing something. I am trying to make this move smoothly back and forth between 2 points. I am trying to Use Lerp and it is still just snapping to the new location. Any thoughts?

void AMovingActor::MoveOrbiters()
	// Orbiter1
	FVector StartPos = FVector(0.f, 1000.f, 0.f);
	FVector EndPos = FVector(0.f, 120.f, 0.f);
	FVector Movement = FMath::Lerp(StartPos, EndPos, 1.f);



I am not sure why the code pasted like that