how to make a model move onto the player's head and fall off of their head when they press a key?

local TweenService = game:GetService("TweenService")
 
local part = Instance.new("Part")
part.Position = Vector3.new(0, 10, 0)
part.Color = Color3.new(0, 0, 0)
part.Anchored = false
part.Parent = game.Workspace
 
local goal = {39.7, 0.5, -127.5}
goal.Position = Vector3.new(10, 10, 0)
goal.Color = Color3.new(0, 1, 0)
 
local tweenInfo = TweenInfo.new(5)
 
local tween = TweenService:Create(part, tweenInfo, goal)
 
tween:Play() 

that is an example of my code. so it is reaching the spawn location where the player is most likely at and it is not working