Why do they have stupid people make the signs?

I spotted this sign the other day on the outside of one of the entrances to the Circus Circus hotel/casino (near the valet station). I stared at it for a while, trying to decipher its meaning, and left still uncertain.

First we have that awful apostrophe hanging out where it doesn't belong.

But then, ironically, it is the complete lack of further punctuation that leads to the ambiguity. Is it a declarative statement that only employees ask for assistance? Is it informing the reader that only employees need to ask for assistance--or even that only employees may ask for assistance?

I suppose the most likely intended sense is approximately this: "Only employees may proceed past this point. All others, please ask for assistance." Sure, that might be too wordy to fit on the sign, but they could effectively, if inelegantly, convey the same meaning simply by adding punctuation: "Employees only. Ask for assistance."

Can I trade an apostrophe for two periods?