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ios - Firebase queryEqualToValue with childKey

I am trying to query data in my Firebase database using:

queryEqual(toValue: Any?, childKey: String?)

My database structure:

Schools {
    testUID1 {
        schoolNameLC: test school 1
    }
}

My query is:

databaseReference.child("Schools").queryEqual(toValue: "test school 1", childKey: "schoolNameLC").observe(.value) { (snap) in
        print(snap)
    }

This query prints out null and I can't quite get it to work. Because of the way my app is set up, I don't know that the key schoolNameLC has a value testSchool1 under the parent key of testUID1. All I want to do is search through the Schools in my database and return anything with a schoolNameLC value of test school 1.

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