Really its not that there is a necessary 'wrong' or 'right' answer here.
The question is 'does your heart condemn you'.
Basically if you feel/know that its something you shouldn't do (maybe you can't even explain it properly - its something you just 'know) then don't do it.
If, on the other hand, you feel that GOD is bigger than this and can work with you through the situation as you shine your light to others while you work there - then do it with all you got serving your LORD!
I have a christian friend of mine who is an evangelist, but who also has to work 'odd jobs' to get by. Anyway, through some sad events his marriage fell apart when he was in his 50's and had to work as a security job to make ends meet.
His job posting was in a crowded bingo hall and his 'gig' there would last 1/2 a year.
They liked him there, because as a christian he could be trusted.
Anyway, after many weeks he got to know some of the locals that would frequent the bingo hall and they would ask him during his breaks/lunch to 'have a game'.
As a christian he always said "no-thanks".
One month things were tough and he found himself behind in paying his rent.
They again asked him, "have a game with us at the end of your shift".
He was about to say his usual "No," when the LORD spoke to him and said
"Play the next game - one card".
Shocked, and surprised he struggled with what he knew was the LORD prompting him to play. So, he told them "ok, I'll play -this time only".
Well, he won - the big one that night paying his rent to the fullest and a little more for food! He (and everyone else there) was surprised and excited for him, it was truly amazing for this older security guard friend.
So, did it pay off his rent?
Yes!
Did he play again?
No, - that would be a gamble!
-eric