I can’t get 3 values out of a function, I get an error message:

Cannot convert value of type ‘(String, String, String)’ to closure result type ‘Void’

this is the code:

func readDataUser() -> (uid: String, plan: String, role: String) {
        
        let ref = Database.database().reference()

        let userUid = AuthManager.shared.retrieveUid

        let nodeUser = ref.child(RefDatabase.users.rawValue).child(userUid())

        nodeUser.observeSingleEvent(of: .value) { snapshot in
            
            let uid = snapshot.childSnapshot(forPath: "uid").value as? String ?? "no name"
            let plan = snapshot.childSnapshot(forPath: "plan").value as? String ?? "no name"
            let role = snapshot.childSnapshot(forPath: "role").value as? String ?? "no name"
            
            return (uid, plan, role)
            
        }
        
    }

I would like you to print the values for me:

let dataUser = RealtimeManager.shared.readDataUser()
        print("User data is: (dataUser.uid) - (dataUser.plan) - (dataUser.role)")