What is this error with my code(Detector For Part Around Player)?

I need help I'm wanting to make a system that can decet heat from bricks I place around the map and take health but the problem is it giving me an error about Workspace not vaild member as Workspace. Any help will be nice.

My Code

while true do
local plr = script.Parent.Parent
	local range = 5
	local brick = game.Workspace.Heat.Heat
	local Heat_F = game.Workspace.Heat

	for _,Heat_F in pairs(Heat_F:GetChildren()) do
		local myDist = 0
		myDist = (game.Workspace[plr.Name].Torso.Position - game.Workspace.Heat[Heat_F].Position).magnitude
		if myDist > 5 then
			print(myDist)
			myDist = 0
		else
			print('Too Far')
		end
	end
end

Error Code

07:16:08.804 - Workspace is not a valid member of Workspace
07:16:08.805 - Stack Begin
07:16:08.806 - Script 'Workspace.Player1.Heat_Detector', Line 10
07:16:08.806 - Stack End

I am super confused. But, well. Try changing it to this:

while true do
local plr = script.Parent.Parent
    local range = 5
    local brick = game.Workspace.Heat.Heat
    local Heat_F = game.Workspace.Heat

    for _,Heat in pairs(Heat_F:GetChildren()) do
        local myDist = 0
        myDist = (plr.Character.Torso.Position - Heat.Position).magnitude
        if myDist > 5 then
            print(myDist)
            myDist = 0
        else
            print('Too Far')
        end
    end
end