How would I add A humanoid walkspeed in this without breaking it?

How do I change the humanoid walkspeed to 24 then when the animation stops the walkspeed resets to 16?

This script already works (Its a running anim script) I just want the walkspeed to 24 when I press Q and 7 seconds later, I want the Walkspeed to return to 16

wait(2)

local player = game.Players.LocalPlayer
local Mouse = player:GetMouse()

Mouse.KeyDown:connect(function(key)
if key == "q" then 
    s = player.Character.Humanoid:LoadAnimation(game.StarterPack.AnimScrip.Animation)
    s:Play()
wait(7)
    s:Stop()
end
end)

local Walk =game.Players.LocalPlayer.Humanoid
local Mouse = player:GetMouse()

Mouse.KeyDown:connect(function(key)
	if key == "q" then
		Walk.WalkSpeed = 24
		wait(7)
		Walk.WalkSpeed = 16
	end
end)

I've tried many times, now I need assistance.

The Player object does not have a Humanoid, you'd be looking for the character. Instead, you should use your regular code, but rather, game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = x. Also, just to save you some keystrokes, I'd recommend setting game.Players.LocalPlayer.Character.Humanoid as a variable so that you can easily reference it multiple times.