Lime&Lemon

My budgie flew into my bathroom unexpectedly and landed on the floor. Then he ran to a tiny nook under the corner of a cabinet under the sink and he hasn’t come out for a long time now. The big problem is, he isn’t that tame yet so it’s harder for me to save him...I can’t see him at all. It seems he is moving around freely and is confined to a narrow space between the cabinet and the wall. Someone please help me...It’s been 2 hours and he still hasn’t come out...