I don’t know how to unlock old iPhone 6+ w/t forgotten ID/passcode for long-long photos.

A relative handed me an old/reset iPhone 6+ (model A1549) 7 years ago before a week-long trip as a child so I could take pics. They’d created a random Apple ID for me to use (I can’t remember it) that isn’t my main and I haven’t used since. It was confiscated on my return and I only found the phone again this week. I can’t guess the lockscreen password (6 #s) and have no clue where the software’s at update-wise given the near decade spent uncharged. The stored data is clearly still there (unknown Apple ID and all), I just have no idea how to access it. It’s like I picked up a random phone off the street just to discover my preteen self had dropped it a decade back and neglected to leave my future self so much as a single helpful hint. Is there any hope of retrieving the photos? It’d mean the world to me to finally have them back.