Yes, an AASP can take care of clearing your EFI firmware password, if you have one that's more convenient to you.
The task itself is not much more than a phone call to service provider support.
They run a service app, which will output a code unique to your system. They send that code to Apple, who returns with a response code that the AASP enters in your system, clearing the EFI password. It's actually a bit more involved, but that's the basic steps that happen.
For obvious reasons, you should be ready to provide some proof of who you are, and proof that you own that Mac.
Wherever you choose to go for service, you should call ahead of time to ask your questions.
Some busy shops may not be able to help while you wait - but your task would not take more than 10 minutes, and you should ask about that before you go
Most shops will suggest that you make an appointment.