How do I tween a model?

Now the ideal way to move models via scripting is PVInstance:PivotTo(), but this cannot be tweened. So we instead we can: Create a CFrameValue, tween it, then apply any changes to the model.

local TweenService = game:GetService("TweenService")

function TweenModel(Model, Info, DesiredCFrame)
    local CFrameValue = Instance.new("CFrameValue")
    local Tween = TweenService:Create(CFrameValue, Info, {Value = DesiredCFrame})

    CFrameValue.Changed:Connect(function(TweenedCFrame)
        Model:PivotTo(TweenedCFrame)
    end)

    Tween.Completed:Once(function()
        Tween:Destroy()
        CFrameValue:Destroy()
    end)
    Tween:Play()
end

Insert a Part into the model and position it to be at the centre of it. You will tween this Part.

Set it's transparency to 1, CanCollide to false and anchor it.

(optional) Set the PrimaryPart of the model to the Part.

Weld the entire model to the Part. I usually use Moon Animator plugin's weld feature, but if you don't have it then you can manually weld the entire model using WeldConstraints and setting Part0 to the Part.

Not sure where your ProximityPrompt is so I'll put it in the Part.

Insert a ProximityPrompt in the Part, and set it's properties.

Insert a Script in the Part.

TweenService = game:GetService("TweenService")

part = script.Parent
prompt = part:WaitForChild("ProximityPrompt")
duration = 5 -- time taken for the model to go up/down

downPos = Vector3.new(0, 0, 0) -- position of the Part when it is down
upPos = Vector3.new(0, 10, 0) -- position of the Part when it is up

isUp = false

tweenUp = TweenService:Create(part, TweenInfo.new(duration), {Position = upPos}

tweenDown = TweenService:Create(part, TweenInfo.new(duration), {Position = downPos}


prompt.Triggered:Connect(function(player)
 if isUp == false then
  tweenDown:Play()
  prompt.Enabled = false
  tweenDown.Completed:Wait()
  prompt.Enabled = true
 else
  tweenUp:Play()
  prompt.Enabled = false
  tweenUp.Completed:Wait()
  prompt.Enabled = true
 end
end)

I typed everything on mobile so let me know if there's any errors.