Why does this not lock players when it locks the rest of workspace?

I tried to do just a simple code, which works for the most part

for i,v in pairs(workspace:GetDescendants()) do
    if v:IsA('BasePart') then
        v.Locked = true	
	end
end

The rest of the script just unlocks certain things (none of which would select a player). Am I missing something? Probably something simple I'm just totally overlooking but appreciate the help.

First off Players are already locked.

But if you really need it:

Solution: The script runs whenever the server is online, not when a player joins. We can easily run the script whenever the player joins by adding it in a PlayerAdded() function.

Code:

game.Players.PlayerAdded:Connect(function(plr)
wait(1.2)
for i,v in pairs(workspace:GetDescendants()) do
	if v:IsA('BasePart') then
		v.Locked = true 
	   end	
	end
end