Tell you what, Nate -- you try it in those words and let us know what happened. But I suggest you do so only after using your one call to call your attorney.
You replied to Palmpilot as if I said it.
"Tell you what, Ron..." you might want to answer the comments of the correct people to make your point.
If its your opinion that calling police on their non-emergency number to discuss someone locking up my property that I need access to -- with no warning, and no way to access it, on a public airport -- is going to land me in jail...
I'll happily state that you're a complete loon.
Key words are...
"Need"... I'd better show a real need versus an inconvenience. This one is critical. Staying in a hotel room overnight is not "need".
"No warning"... if the FBO has made a reasonable effort to explain that the gates are locked and no access is allowed after hours, it's my problem.
"No way to access"... see above. If I was told and then asked how to depart after hours and they said I couldn't, it's already time to leave. Best have your line boy not pump any of that gas (or here's my lower amount I want on board to safely make a hop to a better -- yes, better -- airport.) I'll call them and get a rental car to come back to town.
Let's get real here... I personally know four pilots who just in the last year have hopped a fence and departed airports after-hours. It happens every week, somewhere.
At an "airliner" airport you're running a severe risk. I wouldn't do it today at all. Out in the boonies, you're lucky if even the wind notices. Jump wisely.
Jail time for calling a phone number? Fat chance.
Feel free to feel helpless if you like. I'm whipping out the cell phone and having a polite and friendly conversation with a bored late-night dispatcher if I feel like it's going to find me someone with a gate key.
If the Sheriff gets cranky about it, I'll point out that there are highly effective solutions to after-hours access, and give helpful examples to the Sheriff that he can share with the idiots running the airport tomorrow morning at the coffee shop.
"I don't know why they're making this so difficult for you Sheriff. Honestly, I don't. Thank you for your time and assistance tonight."
You catch more flies with honey than vinegar, and no where in this thread did I say I'd call up and act like the typical Creature of Walmart demanding my "rights" in any communication with our public servants.
Perhaps that's how you'd handle it, therefore you know you'd go to jail? I can't say. How you treat people while presenting the problem is more than 50% of the likelihood of success.
Reality check: The OP is based somewhere where the airport management is retarded. We transient folks already know to ask these questions before tying down somewhere. We're also fully aware of the need to pay someone to come unlock a fence that's not protecting anything at all.
The likelihood I would ever be forced to call law enforcement for assistance is pretty darn low.