I just started my lockpicking hobby adventure a couple days ago, so I went out and bought one of the best Masterlock pads I could find at the local Home Depot. This was the No.5. At first it took me 2 hours to pick it with a diamond pick I made. But now it takes less a few seconds. How?
What I discovered for my particular lock was that if it was turned upside down so the pins fell into their chambers, and a little bit of tension was applied, the last 3 would set themselves. This left only the first pin needed to be picked. I know this may not be the case for all No. 5's, but if you have one, give it a go and report back. Most likely it won't be the first pin, it might be the second, third, fourth, or none of them. But go ahead and play around with it.
I made a video of me picking it in that manner. Skip ahead to ~2:30 to see it.
http://www.youtube.com/watch?v=P_i572Mpnm4