wont crank?

[1bad87]

well it has happen to me twice in a week so am driving and turn it off at a gas station and wen i go in to turn it on i hear it like it "wanted" to crank just for mayb 1 sec l hear it like the starter lock? so i sit there for a couple of min and wont crank i check the battery and was fine good horn and lights everything was ok just wont crank i call my bro and we tow it home and guees what wen i got home it start working again am thinkin the starter is goin bad? a mecanic said it could b the switch. but i relly dont think it is the switch any of u guys had this problem