Why do you want one? Here is Eva Lansoght at PhD Talk:
if you haven’t set up your profile – go there and do so immediately. Having an author profile is as important as having your articles showing up in a search on Google Scholar.
“But wait,” you might be thinking, “I don’t have many citations to my work, and I don’t want to show the whole world that.”
Hmmmm. How can I put this gently? The problem with such thinking is your internal dialogue, not the Google Scholar Profile. If you have a CV online, then you want a Google Scholar Profile. It collects all of your publications in one place, and it has hyperlinks! If your plan to getting tenure is built upon the idea of minimizing access to your work, then may I recommend that you develop a new plan? If you wish to maximize access to your work, then please setup a Google Scholar Profile.
Finally, there is this to consider. When you go up for tenure your university is going to contact a bunch of people and ask them to take a couple of days work from their schedule and devote it to assessing the quality and quantity of your work, and its contribution to the field. Many of us who get stuck with that thankless task (and note, you plan, after earning tenure, to become one of those people) want to use your Google Scholar Profile to assist us. It provides ready access to your publications–with hyperlinks!–in one location. And it also provides us with info about who has cited your work. Put plainly, many of us expect you to have one, and as my advisor, Ted Gurr, reminds us in Why Men Rebel, when one’s capabilities fall short of one’s expectations, one tends to become frustrated, and aggression is an innately satisfying response to frustration. So I ask you: do you want your tenure letter writers to be frustrated? I didn’t think so.