Radius checking not working?

So whenever I try to use the script, the output says "Attempting to compare two user data values", and I don't know how to fix it. Can anyone help?

Here's my code:

local tool = script.Parent

local mychar
local myhum

tool.Equipped:connect(function()
	mychar = tool.Parent
	myhum = mychar:WaitForChild("Humanoid")
	myhum.WalkSpeed = 0
	hold = myhum:LoadAnimation(tool:WaitForChild("Hold"))
	
	hold:Play()
	
	for _,part in pairs(workspace:GetChildren()) do
		if part:IsA("Part") then
		if part.CFrame <= mychar.Torso.CFrame + Vector3.new(8, 8, 8) then
			print(part.Name)
			end
		end
	end
end)

tool.Unequipped:connect(function()
	hold:Stop()
	myhum.WalkSpeed = 16
end)