Has anyone had any luck with the blueberry plants sold by Walmart?

I bought a pair of dormant legacy blueberry plants from Walmart. I planted them and they've been sitting outside in the sun and warm weather, but they won't sprout. They seem to be stuck in winter hibernation mode even after being outside for nearly a month. The weather has been in the 80s and 90s. They still have color in the stems so I don't think they died. Are they a lost cause?