Making Character Move To Point but Still able to move left and right?

Okay, so I'm making a game that you have to get from point A to Point B with obstacles inbetween.

I've tried using various ways to get the character to move forward, but I think the one I should use is the Humanoid's MovetoPoint Property.

I've successfully made a script that makes the character move to a specific point ahead in the stage, but the problem is, It wont let the character move left and right unless you tap the key multiple times quickly.

This is the script.

function a(b) 
if b.Parent:findFirstChild("Humanoid") ~= nil then 
local h = b.Parent:findFirstChild("Humanoid") 


if h ~= nil then 
while true do
h.WalkToPoint = Vector3.new(32.5, 8.3, -225.5)

wait(0.1)
end 
end


end 
end 
script.Parent.Touched:connect(a) 

We can use the http://wiki.roblox.com/index.php?title=Controlling_a_Player%27s_Character

local controllers = {} --From the wiki
 
function removeControl()
	for _, controller in pairs(game:GetService("ControllerService"):GetChildren()) do
		controller.Parent = nil -- Take the controller out of ControllerService
		table.insert(controllers, controller)
	end
end
 
function resumeControl()
	for _, controller in pairs(controllers) do
		controller.Parent = game:GetService("ControllerService") ControllerService
	end
	controllers = {} -- Clear the table
end
 
removeControl() -- Disable their control over their character
game.Players.LocalPlayer.Character.Humanoid.WalkToPoint = Vector3.new(32.5, 8.3, -225.5)
wait(5) --How long it takes for the character to move there.
resumeControl() -- Give them control over their character again

Hope this gives you an idea!