IF ELSE statement in snowflake

Can someone please help me to debug why the following script cannot run in snowflake? It said it has syntax error inside. Thanks

DECLARE
    current_database STRING;
    current_schema STRING;
BEGIN
    current_database := CURRENT_DATABASE();
    current_schema := CURRENT_SCHEMA();

 IF current_database <> 'DEV' OR current_schema <> 'CONFIG' THEN
     RETURN 'WRONG SCHEMA SELECTED';
     ELSE RETURN 'GOOD'
 END IF;

END;

If needs PARENs, but the big kicker is your return 'good' is missing the semicolon:

DECLARE
    current_database STRING;
    current_schema STRING;
BEGIN
    current_database := CURRENT_DATABASE();
    current_schema := CURRENT_SCHEMA();

 IF (current_database <> 'DEV' OR current_schema <> 'CONFIG') THEN
     RETURN 'WRONG SCHEMA SELECTED';
     ELSE RETURN 'GOOD';
 END IF;

END;

It can also be shrank a bit more:

BEGIN
    let current_database string := CURRENT_DATABASE();
    let current_schema string := CURRENT_SCHEMA();

    IF (current_database <> 'DEV' OR current_schema <> 'CONFIG') THEN
        return 'WRONG SCHEMA SELECTED';
    END IF;
    
    return 'GOOD';
END;

or even to:

BEGIN
    IF (CURRENT_DATABASE() <> 'DEV' OR CURRENT_SCHEMA() <> 'CONFIG') THEN
        return 'WRONG SCHEMA SELECTED';
    END IF;
    
    return 'GOOD';
END;