A "slim jim" is a tool used to unlock car doors. I grew up around body shops and salvage yards, and I've used one. We'd sometimes get insurance salvage or theft recoveries locked, and without the keys. You use a slim jim to slide down past the glass seal into the inside of the door and snag the actuator rod that locks and unlocks the door. It's very thin and flexible, and I'd think it would be worthless for prying open a house door or window.
Uh, no, it’s exactly what is used to turn the flip-latches used on most residential windows.
You can also use the piece of awing to slip in between the doorframe and door latches (not the bolt type) to unlock house doors. Back in the day, I didn’t have a house key so used various items like that to get into my house after school. Just as quick as a key and didn’t have to worry about losing a key. My parents never understood just how unsecured the house really was.