How can I make this model not go any further?

local model = script.Parent
local available = true
function open()
	if available == true then
		for i = 0,2,0.1 do
		model:SetPrimaryPartCFrame(model:GetPrimaryPartCFrame() * CFrame.new(-.25,0,0))
		wait()
		end
	end
end
script.Parent.ClickDetector.MouseClick:connect(open)

if model.Main.Position >= Vector3.new(-244.769, 139.06, 51.98) then
	print("part can't go any further!")
	local available = false
end

I'm pretty sure the whole Vector3.new thing is wrong, but I'm not sure how to make the model not go any further once the PrimaryPart is or past a certain coordinate.

you could just put a Boolean variable to check if model is done moving like this:

local model = script.Parent
local available = true
local isdoneMoving = false

local function open() -- use local functions
    if available == true and isdoneMoving == false then
        for i = 0,2,0.1 do			model:SetPrimaryPartCFrame(model:GetPrimaryPartCFrame(CFrame.new(-.25,0,0)))
        	wait()
        end
	isdoneMoving = true
    end
end

open() -- i guess you want the function to execute automatically

script.Parent.ClickDetector.MouseClick:Connect(function() -- connect is decaperated and you forgot to put "function" because the event is connecting to the function
	if isdoneMoving == true then
		print("part can't go any further!")
  		local available = false
	end
end)

you also didnt call the function open so it wont execute, and theres probably scripting mistakes i didnt notice, so correct me. theres probably better ways then doing this, but im too clumsy right now lol