I think you have it backwards.
Smart Folks will learn how to press a switch, even if it requires "Oomph".
On/Off buttons are easy, hacking Computers are far harder than pressing a button.
1) Data can't see behind himself, he's limited to the same FoV as a Human Being
2) Multiple Strong Aliens or other Androids could hold him still long eonugh that a 3rd person can press the button.
3) If you lack man power, a custom projected Force Field can hold him "Still Enough" that you create a small opening in said Force Field to DeActivate him.
Hacking takes A LOT more knowledge about the specific Platform, Weaknesses, & Accessibility to even work.
On/Off buttons are easy once you know where they are and how much force you need to incapacitate the Android.