How do you make an e system with FE? (When you press e, you should blow up a vault)

I am working on a game, similar to Jailbreak, with no police. I am making a bank. You press "e" to blow up the vault. I'm not sure if I have to use a remote event or a remote function.

Here are the two scripts: 1 (Local Script)

local userInputService = game:GetService("UserInputService")
local bar = script.Parent.Bar3

game.ReplicatedStorage.EGuiEvents.EGui2.EnableEGui.OnClientEvent:Connect(function()
	if workspace.Vault.Base.CanCollide == true then
		script.Parent.Visible = true
	end
end)

userInputService.InputBegan:Connect(function(i, g)
	if script.Parent.Visible == true then
		if i.UserInputType == Enum.UserInputType.Keyboard then
			if i.KeyCode == Enum.KeyCode.E then
				if workspace.Vault.Base.CanCollide == true then
					bar:TweenSize(UDim2.new(0, 70,0, 5), "Out", "Linear", 5)
					wait(5)
					if bar.Size == UDim2.new(0, 70,0, 5) then
						bar.Size = UDim2.new(0, 1,0, 5)
						
						script.Parent.Visible = false
						
						local humanoid = workspace[game.Players.LocalPlayer.Name].Humanoid
						local anim = humanoid:LoadAnimation(script.Animovement)
						anim:Play()
						
						script:WaitForChild("Script").Disabled = false
						script:WaitForChild("Script").Parent = workspace.Bomb
						
						repeat wait(1) until workspace.RobberyInProg == false
						spawn(function()
							workspace.Bomb:WaitForChild("Script")
							
							workspace.Bomb.Script.Parent = script
							script:WaitForChild("Script")
							
							script.Script.Disabled = true
						end)
					end
				end
			end
		end
	end
end)

Script 2 (Sever Script)

player = game.Players:GetPlayerFromCharacter(workspace:FindFirstChild(player.Name))
if player then
	repeat wait(1) until script.Parent == workspace
	script.Parent.Bomb1.CanCollide = true
	script.Parent.Bomb1.Transparency = 0
	
	wait(3.2)
	
	script.Parent.Bomb2.CanCollide = true
	script.Parent.Bomb2.Transparency = 0
	
	wait(3.2)
	
	script.Parent.Bomb3.CanCollide = true
	script.Parent.Bomb3.Transparency = 0
	
	wait(4)
	
	script.Sound:Play()
	
	for i,v in pairs(script.Parent:GetChildren()) do
		if v:IsA("UnionOperation") then
			v.CanCollide = false
			v.Transparency = 1
		end
	end
	workspace.Vault.Base.Transparency = 1
	workspace.Vault.Base.CanCollide = false
	
	repeat
		wait()
	until workspace.RobberyInProg == false
	
	script.Parent = game.ReplicatedStorage
	
	workspace.Vault.Base.Transparency = 0
	workspace.Vault.Base.CanCollide = false
end

Any help?

The difference between Remote Events and Remote Functions is mainly that the Remote Event cannot tell the player / server depending on where the signal originated, to do anything afterwards.

If you used a Remote Function, you could have a Gui pop-up on the player's screen telling them the bank was destroyed (only the player that activated the sequence), but otherwise I would advise using a Remote Event.

Since you did not specify that anything was wrong with the script, I won't really delve into that unless you ask.

More information about Remote Functions / Events can be found here: https://wiki.roblox.com/index.php?title=Remote_Functions_%26_Events