I wouldn't leave my house unlocked. Firefighters don't normally go into homes that are burning in a wildfire. When there is so much fire all around, if your home catches fire, that's it. Firefighters focus their attention on keeping the fire from spreading to adjacent homes. They don't have enough resources to actually try, and save a house that has started to burn. If you're lucky a water dropping aircraft may come by to dump a load on your house.