How to make a model or part rotate about its origin/center?

I recently made a successful script for a chest which flips open if you click on it. However, it rotates weirdly upon clicking. More like rotating around another point, instead of the object's center. Here is the script:

function onClicked(PlayerWhoClicked)
	script.Parent.Lid.CFrame = CFrame.Angles(math.rad(5), 0,0)

end
script.Parent.ClickDetector.MouseClick:connect(onClicked)

Is there any specific type of rotation I should use?

Well we can use CFrame to do this

If our object is a model use :SetPrimaryPartCFrame() if a basepart then change its CFrame It will also check if the model has a primarypart so make sure it's set

local thing = workspace.Model

if thing:IsA("BasePart") then
	thing.CFrame = thing.CFrame*CFrame.Angles(math.rad(5), 0,0)
elseif thing:IsA("Model") and thing.PrimaryPart~=nil then
	thing:SetPrimaryPartCFrame(thing:GetPrimaryPartCFrame()*CFrame.Angles(math.rad(5), 0,0))
end

Now let's combine your script and this one I will also combine your function and where u call it

script.Parent.ClickDetector.MouseClick:connect(function(plr)
	local thing = script.Parent.Lid
	
	if thing:IsA("BasePart") then
		thing.CFrame = thing.CFrame*CFrame.Angles(math.rad(5), 0,0)
	elseif thing:IsA("Model") and thing.PrimaryPart~=nil then
		thing:SetPrimaryPartCFrame(thing:GetPrimaryPartCFrame()*CFrame.Angles(math.rad(5), 0,0))
	end
end)