FOR UPDATE SKIP LOCKED and get locked row/avoid updating other row(s)

Hi!
I am implementing a queue using PostgreSQL.
I am of course using "FOR UPDATE SKIP LOCKED".

Is there any way I can tell PostgreSQL to only "operate" on the locked row,
and/or a way to reference it?

Some explanations of what I mean:

- I have a table with N rows
- I lock row X with a PG Function, in transaction 1
- I do something in my code, using transaction 2
- I update the status of row X with a PG Function, in transaction 1

In last step, I update the row X status, passing my function the ID of this
row X.
But, nothing stops me from updating row Y in the queue table, for whatever
reason.

My question again: any way to force a "Just update the row X you locked
before, and nothing else/more?"

Thanks!