Your preflop raiser has something like AK or AQ, and the other guy might have a 
draw.
Your read here has to be that your opponents are not drawing to a better 
full house. That's because the 
flop came out 6 high. If someone had the 6 here they would 
raise or 
fold on the 
flop. If someone had 56 they would 
raise real hard.
The only thing you have to be worried about is a high 
pocket pair spiking a 
set. Neither of these guys have that. The guy with a high 
pocket pair would 
re-raise your $5. You 
overbet the 
flop like you hit the 6 
rag and 
don't want overs chasing. That's why I 
don't put either of them on that high 
pocket pair. Your never going to buy this pot if someone has a high 
pocket pair. Your going to get called 
all-in. Trust me, they 
don't have it. The board is too scary to 
smooth call $5 with a high 
pocket pair.
Given all of that, this is NOT a good time to slowplay by checking. It has nothing to do with you getting drawn out either. It has to do with the high likelyhood that one of these opponents will 
call an additional bet. This is a good time to 
act weak and bet just $5 again. 
Don't 
buy the pot. Just bet enough where they want to see that 
river.
This is a perfect example of where you take advantage of pot committment. Your two opponents are leveraging themselves against each other by calling $5. They have committed each other, and will stay in for additional like bets. You should bet $5 again. It look like YOU are drawing now, and at least one of them will 
call or even go 
over the top sensing weakness. 
$5 is the correct 
turn bet in this situation.