#freecycle iPhone XR

This iPhone is in really rough condition with a cracked screen and back glass but the phone case is holding it together. It is locked and ready to be used for parts, if you’d like to pick it up. It powers on and holds a charge well. I found it at a gas station while I was traveling over two years ago. The fuel attendant did not want to take it to hold in case the owner returned. He told me, if I left it by the gas pump, he would throw it in the trash. I posted it on social media and Craigslist to no avail and forgot about it. While I was cleaning out cabinets, I came across it. It is locked, please keep that in mind and I have no idea how to unlock it.