I just had to work on a Victory with a frozen cylinder latch. I popped the side plate (I had to put some Kroil on the screws and let them soak for an hour), sprayed the insides with a large dose of carb cleaner, let that drain/dry, then liberally applied Kroil to the works. I left it about an hour and the latch popped free. All good.
I am almost always pleasantly surprised by the condition of these old guns under the side plate. This one had some very old grease, was very dry, but there wasn't a trace of rust, corrosion, fouling, etc.
Like everybody says...don't pry on that side plate, and for goodness sake use a properly sized screw driver.