After some googling alittle, some people say to cut the branches under water, some say cut up the stem, or bash the stem (which is very woody). I just cut them outside and came in put water in a vase and placed them inside. Maybe you would get faster results with some tricks but I didn't use or need them.
I think it was my parents who mentioned doing this, it seems to be pretty common with forsythia which is one of the first bushes to bud in the spring. Its the one that flowers first with bright yellow leaves and then turns green for the remainder of the year.
Here are some pics after 4 days: finally starting to see some buds doing their thing.
After 6 days: green & yellow everywhere almost ready to open up.
Today, day 7. I woke up to open yellow blooms!
I think tomorrow (and the next week or so) will be more and more yellow!