Load up Unreal Editor and make space for the door.
Then, open up the Generic Browser and go in the following directory: CookedPC/Script/SPT_Doors.upk
Now you wanna find and click on SP_DoorBargeable_01
Close/Minimise the Generic Browser
Right Click on where you want the door, and click Add Prefab.
Launch your map and try to open the door.
If the door won't open, Right Click the door and click on Actor Properties. Open the Interaction and check if the bInteractable is checked, if not check it
Hope this helped you out! ;)