Animation playing after second button click

Help and Feedback Scripting Support
#1

Hi all,

I animated doors for my train and scripted it to a button, but the animation only plays after the second click. Does anyone know why?

LocalScript:

local btn = script.Parent
local plr = game.Players.LocalPlayer

local event = game:GetService("ReplicatedStorage").doors

btn.MouseButton1Click:Connect(function()
	local train = plr.Character.Humanoid.SeatPart.Parent
	event:FireServer(train, "left")
	btn.Visible = false
	wait(5)
	btn.Visible = true
end)

Script:

local event = game:GetService("ReplicatedStorage").doors
local doorsleft = script.Left
local doorsright = script.Right

local bool = true

event.OnServerEvent:Connect(function(p, train, side) -- the disabled code is for testing
	for i, car in pairs(train:GetChildren()) do
		if bool == true then
			if side == "left" then
				if car.Name == "Carriage1" then
					local model = car.Model
					local hum = model.Humanoid
					local animator = hum:WaitForChild("Animator")
					
					task.wait(0.5)

					local leftTrack = animator:LoadAnimation(doorsleft)

					leftTrack:Play()
					leftTrack:AdjustSpeed(1)
					task.wait(leftTrack.Length-0.05)
					leftTrack:AdjustSpeed(0)
				end
			elseif side == "right" then
				if car.Name == "Carriage1" then
					local model = car.Model
					local hum = model.Humanoid
					local animator = hum:WaitForChild("Animator")
					
					task.wait(0.5)

					local leftTrack = animator:LoadAnimation(doorsright)

					leftTrack:Play()
					leftTrack:AdjustSpeed(1)
					task.wait(leftTrack.Length-0.05)
					leftTrack:AdjustSpeed(0)
				end
			end
		elseif bool == false then
			if side == "left" then
				if car.Name == "Carriage1" then
					local model = car.Model
					local hum = model.Humanoid
					local animator = hum:WaitForChild("Animator")
					
					task.wait(0.5)

					local leftTrack = animator:LoadAnimation(doorsleft)

					leftTrack:Play(0.100000001, 1, -1)
					task.wait(leftTrack.Length-0.01)
					leftTrack:AdjustSpeed(0)
				end
			elseif side == "right" then
				if car.Name == "Carriage1" then
					local model = car.Model
					local hum = model.Humanoid
					local animator = hum:WaitForChild("Animator")
					
					task.wait(0.5)

					local leftTrack = animator:LoadAnimation(doorsright)

					leftTrack:Play(0.100000001, 1, -1)
					task.wait(leftTrack.Length-0.01)
					leftTrack:AdjustSpeed(0)
				end
			end
		end
	end
	
	bool = not bool
end)

Any help is appreciated, this has been annoying. Thanks!