Shortest Konami Code
05AB1E, 33 bytes (Fine on Empty Input)

Dg0Qiq}•ï“ë™µyê!•36BQi7ç“+30™‹“J,


Try it online!

05AB1E, 30 26 bytes (Fails on Empty Input)

-4 thanks to Adnan

•ï“ë™µyê!•36BQi7ç,“+30™‹“,


Try it online!

•ï“ë™µyê!•36B                  # UUDDLRLRBABA in base-214, converted back to base-36.
             Qi                # If implicit input is equal to...
               7ç,             # Print 7 converted to a character to the console (bell sound)...
                  “+30™‹“, # Print +30 lives.


Disclaimer: Bell sound does not play on TryItOnline, maybe ask Dennis if one of his servers somewhere is pinging when you run it.