I would say yes, like many of the others just because english is something that cannot be avoided even if you try, its everywhere. I definitely think that if you haven't learned it yet you should because most of the technologies these days is in English, and yes it definitely helps to get a job if you can speak that.
Now i don't know if it easy to learn because English is one weird language if you think about.. Knot is not and Know is no and There is their. So i don't think its easy to learn but i doubt its harder than Mandarin.
So all in all, yes and i would most definitely encourage anyone who doesn't know it to take it, for a brighter future.