Getting the Alan Wake 2 screwdriver will let you bust open certain containers for extra resources or doors to new areas. In fact, you've probably already found several of these keyless locks around Alan Wake 2 while wandering as Saga, but there's no way to get them open before grabbing the screwdriver over in Watery, which means you'll have to do some backtracking. Fortunately, the screwdriver is an essential tool for Saga, and isn't something you can miss as you play through her story. Here's the location of the screwdriver in Alan Wake 2, and what you can use it for once you have it.
Alan Wake 2 screwdriver location
The screwdriver in Alan Wake 2 is found when you head to the area of Watery for the first time - specifically when you go to the amusement park Coffee World just past it. At this point in the game, you should have completed the first sequence as Alan and been given control over who you play as - Alan or Saga. If you want the screwdriver sooner rather than later choose Saga and use the car to head to Watery, then follow the main story path until you reach Coffee World, attempting to get to your trailer.
You'll need to get inside the gift shop once you reach it, but the door is locked and it needs a screwdriver to open - something that a note on the door will tell you can be found on the Percolator ride, which I've marked on the map for you above.
Once you reach the Percolator, you'll be attacked by two taken, one of which is inside some rising cover in the middle of the ride. You don't have to kill them, but it's safer to just deal with them and get it over with - then you can grab the screwdriver, which is lying on the control panel on your left side when you step onto the ride itself.
Now you have the screwdriver, you'll be able to open any lock that requires it - including the one back at the gift shop. Of course, there's another obstacle once you're in there - and fortunately, I also put together a guide on the Alan Wake 2 gift shop safe code if you need help with that. You'll no doubt have also noticed several paths blocked by chains that require Alan Wake 2 bolt cutters to get past, but you'll need to progress through Saga's to get those.
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