Actually i have fixed my code and optimized your door model! I mean i have deleted all useless parts for me!
DoorTestsFixed2.rbxl (74.2 KB)
(I have reuploaded this file cuz there was my mistake, i have created multiple useless welds)
local TweenService = game:GetService("TweenService")
local doorModel = script.Parent -- Assuming the script is a child of the door model
local mainDoorModel = doorModel.DoorPart -- Model you want to rotate
local proximityPrompt = doorModel.DoorPart.Prox:FindFirstChild("ProximityPrompt")
local proximityPromptBack = doorModel.DoorPart.Prox2:FindFirstChild("ProximityPrompt")
local primaryPart = mainDoorModel.PrimaryPart
local hinge = mainDoorModel.Hinge -- Assuming there's a part named "Hinge" as the hinge point
local DB = false
local isOpen = false
local savedCFrame = mainDoorModel.PrimaryPart.CFrame -- Just to make our life easier
local openAngle = -90 -- Adjust the angle as needed
local tweenInfo = TweenInfo.new(0.5, Enum.EasingStyle.Quad, Enum.EasingDirection.InOut)
-- Ensure all decals are welded to the door part
for _, child in ipairs(mainDoorModel:GetChildren()) do
if child:IsA("BasePart") and child ~= primaryPart then
local weld = Instance.new("Weld")
weld.Part0 = primaryPart
weld.Part1 = child
weld.C0 = primaryPart.CFrame:Inverse() * child.CFrame
weld.Parent = primaryPart
end
end
for _, child in ipairs(doorModel:GetChildren()) do
if child:IsA("BasePart") and child.Name ~= "Frame" then
local weld = Instance.new("Weld")
weld.Part0 = primaryPart
weld.Part1 = child
weld.C0 = primaryPart.CFrame:Inverse() * child.CFrame
weld.Parent = primaryPart
end
end
local function getOppositeDirection(player)
local playerPosition = player.Character.PrimaryPart.Position
local doorPosition = primaryPart.Position
local doorLookVector = primaryPart.CFrame.LookVector
local direction = (playerPosition - doorPosition).Unit
return primaryPart.CFrame.LookVector:Dot(direction) > 0 and -1 or 1
end
local function onProximityPromptTriggered(player)
if DB then return end
DB = true
if isOpen then
isOpen = false
local tween = TweenService:Create(primaryPart, tweenInfo, {CFrame = savedCFrame})
tween:Play()
tween.Completed:Wait()
-- Add logic to close the door after a delay if needed
DB = false
return
end
isOpen = true
local direction = getOppositeDirection(player)
-- Calculate the target CFrame for the door
local hingeCFrame = hinge.CFrame
local rotation = CFrame.Angles(0, math.rad(openAngle) * direction, 0)
local goalCFrame = hingeCFrame * rotation * hingeCFrame:Inverse() * primaryPart.CFrame
local tween = TweenService:Create(primaryPart, tweenInfo, {CFrame = goalCFrame})
tween:Play()
tween.Completed:Wait()
-- Add logic to close the door after a delay if needed
DB = false
end
proximityPrompt.Triggered:Connect(onProximityPromptTriggered)
proximityPromptBack.Triggered:Connect(onProximityPromptTriggered)
Please reply if it works and send your vid 
You can test some tween animations for your door to look smoother