Extra duties without pay

[Raintree]

"Have they changed the procedure? I know you wouldn't ask me to go against procedure, boss. Should I get clarification from HR?"

I kinda like this idea too, as I used to work for a large retail chain in which everything had a procedure. On paper, it looked like a great company to work for. In practice, management at store level were always trying to cut corners so that THEIR performance would appear stellar to the higher ups in the corporate offices. In other words, they liked to appear that the job was being done efficiently and effectively while remaining well under the payroll budget. They achieved this by sneaky tactics like the one described by the OP. Get this employee to do that extra thing but we just won't run it by head office. Send employees home early with no notice whatsoever (and no pay) when it's unexpectedly slow, even though corporate policy (and law, for that matter) that X amount of notice is to be given for changes in scheduling. Word it as "Would you LIKE to go home early?") and let it be known that if you say no, you won't be seen as a team player and will probably get the lion's share of the undesirable shifts from now on. Etc. etc.  I could have used some of these lines when I worked there.

[Sophia]

I just made a connection in my head.  CoWorker is asked to be a trainer for a job her employer decided she wasn't qualified for.

[Lynn2000]

I like both Sophia's and WillyNilly's approaches. Of course it depends on the corporate environment and whether there really is someone approachable above Boss's head, or an HR department. You could also try approaching it with Boss in terms of policy/legalities (for lack of a better word)--everyone is living in fear of auditors these days, what if the bank gets audited and they find out the new Assistant Manager was trained by someone who was "clearly" unqualified, because they (you) had not taken the training course and/or were not getting paid a salary that suggested you had the experience to train? Seems silly, but I've seen auditors pick up on exactly that sort of thing, even when everyone involved is being totally above-board. Boss trying to cut corners and save money now could come back to haunt him later.

[RegionMom]

Been there, done that.
And if you do it for free, you will NOT get any recognition.