How would you activate Global functions and local functions in a keybind?

First off, what I am doing is having a single LOCAL script inside the players player gui named "InteractTrigger" Scan for every single part that has a string value named "Interaction" in it. If they step into range (using magnitude of course..) of a part with that String value in it, the script in the player gui will cause a Gui telling them "[e] To interact"

When they press the e Key, it will either perform a local function or a global function and that's where I am stumped.. You see there will be multiple interact-able parts in the game. So every single one will perform a different function when the user presses e while being in range of said part.

All the InteractTrigger script will be doing is checking if the player is in range of a part that has the String value named "Interaction" in it and checks if the player is in range of it and when they press E it will either perform a global function or a local function

Examples If user is in range of part1 and presses E then a gui will be put in their player gui.

If user is in range of part2 and presses E then a brick will be created in the Workspace.

These examples resemble local functions and global functions Part1 is local Part2 is global

I already created a script to check if the player is in range of a part with String Value "Interaction" in it. I already have made the keybind if they press e.

MY PROBLEM I don't know how trigger the global functions and local functions. Because InteractTrigger script is just a framework for doing as said above. It can't just perform the functions to all the parts. There must be a efficient way than just having it disable a script that is inside each part if the user presses e. Because I've tried that and it does not work...

Any other method I could do this? I'm so stumped right now and I worry if I can continue development.

InteractTrigger script

ocal me = game:GetService("Players").LocalPlayer
local mouse = me:GetMouse()

-- REQUIRES: model and descendants of model can have :GetChildren() called
-- on them.
-- PURPOSE: Given a model, returns a list of all of the descendants of that model.
-- [If result is specified, it will add the descendants of result to model.]
function descendants( model, result )
	result = result or {} -- No need to pass in result
	for _, child in pairs(model:GetChildren()) do
		table.insert(result, child) -- Much cleaner way to add to list
		descendants(child, result)
	end
	return result -- Return the accumulated children
end

-- PURPOSE: Returns whether or not this part is an interaction site.
-- REQUIRES: part must be a ROBLOX object.
function isInteraction( part )
	return part:IsA("BasePart") and part:FindFirstChild("Interaction") and part.Interaction:IsA("StringValue")
end

local interactions = {} -- List of all interaction sites.
local everything = descendants( workspace )

for _, object in pairs( everything ) do
	if isInteraction( object ) then
		table.insert( interactions, object )
	end
end

-- Define the GUI we give to players
local interactionGui = game.ReplicatedStorage.InteractionGui

-- Define near, sets to nil
local near

-- REQUIRES: player is a Player, they have a Character (with torso) and PlayerGui.
-- PURPOSE: Shows or hides (by deleting/inserting) the InteractionGui
-- based on whether or not they are close to any interaction site (in `interactions`)
function update(player)
	-- We defined the table of "interactions" above
	local torso = player.Character.Torso
	for _, interaction in pairs(interactions) do
		if (interaction.position - torso.Position).magnitude <= 3 then
			-- Within three studs of interaction's center
			near = interaction
			local mouse = game.Players.LocalPlayer:GetMouse()
			mouse.KeyDown:connect(function(key)
				if near and key == "e"  then
					interaction.Operation.Disabled = true
				end
			end)
		end
	end
	local playerGui = player.PlayerGui
	local hasGui = playerGui:FindFirstChild( interactionGui.Name )
	if near then
		-- I am near an interaction
		if not hasGui then
			interactionGui:Clone().Parent = playerGui
		end
	else
		-- I am NOT near ANY site
		if hasGui then
			hasGui:Destroy()
		end
	end
	
end

-- Update all players
function updateAll()
	for _, player in pairs(game.Players:GetPlayers()) do
		if player.Character and player.Character:FindFirstChild("Torso") and player:FindFirstChild("PlayerGui") then
			update(player)
		end
	end
end

while wait(0.1) do
	updateAll()
end