How Do I Force a player to sit in a VehicleSeat and make them not be able to leave?

function module:CarSpawn(player,Pos,par)
    wait()
    local car
    local val = player:WaitForChild("Values")
        local kt = val:WaitForChild("KartChosen")

        repeat wait() until (carModels:FindFirstChild(val.KartChosen.Value)) 
     car = carModels:FindFirstChild(val.KartChosen.Value):Clone()

        --anchor(car,true,true,"VehicleSeat")   
    local center = car:GetModelCFrame() 
    TransformObjects(car:GetChildren(),center,Pos +Vector3.new(0, (car:GetExtentsSize().Y /2) + 1,0),true)  

    car:MakeJoints() wait() 

    repeat wait() until player.Character
    repeat wait() until player.Character.Torso


    player.Character.Humanoid.WalkSpeed = 0
     car.Parent=par car:MakeJoints()
    Instance.new("Model",car).Name = "DestoryOnLeave"
    --player.Character.Torso.CFrame = car.VehicleSeat.CFrame + Vector3.new(0,car:GetExtentsSize().Y  + 1 ,0)

    local Xeld = Instance.new("Weld",car.VehicleSeat) -- makes a weld 
    Xeld.Name = "SeatWeld"
    Xeld.Part0,Xeld.Part1  = Xeld.Parent,   player.Character.HumanoidRootPart -- welds the parts
    player.Character.Humanoid.Sit = true -- makes the player sit
    Xeld.C0,Xeld.C1 = CFrame.new(   0, 0.6, 0, 1, 0, -0, 0, 0, 1, 0, -1, -0),CFrame.new(0, -1.5, 0, 1, 0, -0, 0, 0, 1, 0, -1, -0)
    --Aujust the positions.




   return car

end 

Thats the code, All works as expected aparting from welding the player to the seat.

    local Xeld = Instance.new("Weld",car.VehicleSeat) -- makes a weld 
    Xeld.Name = "SeatWeld"
    Xeld.Part0,Xeld.Part1  = Xeld.Parent,   player.Character.HumanoidRootPart -- welds the parts
    player.Character.Humanoid.Sit = true -- makes the player sit
    Xeld.C0,Xeld.C1 = CFrame.new(   0, 0.6, 0, 1, 0, -0, 0, 0, 1, 0, -1, -0),CFrame.new(0, -1.5, 0, 1, 0, -0, 0, 0, 1, 0, -1, -0)
    --Aujust the positions

The exact code "sniped" that dose not work as expected.

Any question feel free to ask though pm on roblox or comment below, Username : DarkBeemo