Give it another day or so and if it's still showing no signs of activity, go buy a packet of US-05 and sprinkle that in there.
And I will add that you are underpitching...not TOO badly, but still. However US-05 is the same strain as WLP001, and the dry 11.5g packets contain way more viable yeast cells than your brand-new White Labs vial, which has roughly 100 billion cells on the manufacture date. Typically an 11.5g packet will have roughly twice as many viable cells as the vial/smack pack; more than enough to happily ferment 5 gallons of 1.042 wort. I've got nothing against White Labs...in fact I think they are awesome, and the huge pile of empty vials in my growing collection will attest to that. But I don't use WLP001 unless someone gives me the vial to use, because I think the dry packets are easier to deal with, smaller, store more easily, are more stable, and most of all contain much larger quantities of yeast. Oh, yeah and they tend to be cheaper than the vials, too.