set_autopilot API can't stop the vehicle

[lightlefter]

CARLA version:0.9.12
Platform/OS:windows10
Problem you have experienced:set_autopilot API can't stop the vehicle
What you expected to happen:stop the vehicle from autopilot
Steps to reproduce:

In my python script. I set the autopilot to all spawned vehicle.

for vehicles in world.get_actors().filter('vehicle'):
vehicles.set_autopilot(True)

It runed perfectly.
But,When I tried to stop all the vehicle(set_autopilot(False)),I failed to stop them. Those vehicle holds different VehicleControl VehicleControl(throttle=0.631335, steer=0.000000, brake=0.000000, hand_brake=False, reverse=False, manual_gear_shift=False, gear=1)
I can't apply any VehicleControl to any vehicle. How to stop those vehicle.

The API I tried:
(1)
vehicle_control = carla.VehicleControl(throttle=0.000000)
for vehicles in world.get_actors().filter('vehicle'):
vehicles.set_autopilot(False)
carla.command.ApplyVehicleControl(vehicles,vehicle_control)
carla.command.ApplyTargetVelocity(vehicles,carla.Vector3D(0,0,0))
(2)
traffic_manager = client.get_trafficmanager()
traffic_manager.shut_down()
for vehicles in world.get_actors().filter('vehicle'):
vehicles.set_autopilot(False)
carla.command.ApplyVehicleControl(vehicles,vehicle_control)
carla.command.ApplyTargetVelocity(vehicles,carla.Vector3D(0,0,0))