I agree with David and John. In 40+ years of photography I don't think I have ever had a lens stop working after a period of non-use. I may run it through a serious of shutter activations at differing speeds and apertures just to "freshen it up" - but apart from that, I'd just use it. I certainly wouldn't get it services.
But storage and the possible accumulation of mildew/mould is something else. I've had 3 Nikkor lenses go mouldy: a 60mm which was written off as a result, and an 18-200 and 40-800 both of which could be repaired but, for the later especially, at eye-watering cost.