Fob Stuck! Keyfob stuck in ignition slot...

AAARGH!
Last night I dropped my '05 at the valet at the MGM Grand in Vegas before a show. I thought it was worth the $24 + 5 tip to save the Saturday night hassle of self-parking: Hahahaha... lmao.
They brought the car out at 11:30, I drive back to my hotel, go to remove my fob and:
- They had broken off the fob's black plastic loop and my little attached keychain bottle-opener is gone
- They jammed the fob into the ignition and now I can't pry it out.

Obviously, the idiot(s) did not properly shift it into "Park" and then yanked on the fob so hard they broke the fob's plastic keychain retainer loop. Grrrrr.

After it is removed (either by a locksmith at MGM's expense or myself) I'll make a replacement "grab-tab" using gorilla tape stuck to the fob.

I'm checking-out shortly and heading back to chew them out in person, however when I called last night MGM juggled me and said that the valet is a 3rd-party operation.
I know how this is going to go:
"If you accept the car we have no liability..."

Surprisingly, I'm having trouble searching threads on this subject here. The most recent is dated 2015, so hopefully there's fresher advice than:
- Disconnect the battery and "hope" that the fob lock solenoid "releases" the fob
- Disassemble the dash (!)

If that remains the best advice, a few questions:
- Re disconnecting 12v battery, both pos/neg terms and for how long? Or, as soon as energy absent should the solenoid retract?

- I haven't yet been out to the car this morning: Presuming nobody jumped-in and drove-away, it sounds like I may be greeted by a dead battery.
If so, any Prius-specific battery-jumping 'no-no's'?

- Re dash-disassembly solution, anybody know how extensive the required disassembly is? Procedure details?
(I brought minimal tools on this trip)

Thanks!

Keywords: fob key-fob jammed jam unremovable won't retract p*nche valets

 

Update:
First, thanks for the jumping-terminal heads-up!

So, I just went out to do battle and...
My fob was sitting under a clipboard on the passenger seat!

These beasts are still new to me.
For example, I now gather that:
- You don't need to have the fob in the ignition slot, just within X distance of the ignition (like sitting on the passenger seat)
- The ignition 'pouch' that the fob slides into is not physically deep enough to insert the entire fob; there's always about a 1/2"/12mm sticking out.
- It has solenoid-controlled tabs that can refuse to release the fob, but there will always be a portion of the fob protruding.

So, what I was feeling was the little ignition flap not a completely-inserted and jammed fob.
Hey, it was late, dark and I was, say, .07 bac.

Sorry to bother the crew.

Thanks.