It's perfectly safe as long as he doesn't touch the trigger hairs* inside the trap.
Via Lost Found and Envied.
*Each leaf of the trap contains 3 trigger hairs, of which 2 or more have to be stimulated in succession (ie, within a few seconds of each other) for the trap to close. This type of triggering best simulates an insect crawling on it, so the plant doesn't waste energy closing on, for example, a raindrop. [hat tip to Spyra for providing details re the trigger]