Gate does only opens once and not again?

Hi, i'm making a castle gate but when the gate has opended it won't open again.

db = true
script.Parent.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChild("Humanoid") and db == true then
		db = false
		while wait() do
			if script.Parent.Position.Y <= 26.578 and db == false then
				script.Parent.Position = script.Parent.Position + Vector3.new(0,0.1,0)
			else
				wait(7.5)
				while wait() do
					if script.Parent.Position.Y >= 9.089 and db == false then
						script.Parent.Position = script.Parent.Position - Vector3.new(0,0.1,0)
					else
						if script.Parent.Position.Y == 9.079 then
							db = true
							break
						end
					end
				end
			end
		end
	end
end)

I checked the positions, they're just fine.