“Criminal sanctions are retrospective in nature; they seek to punish a contemnor for past acts which he cannot now undo. Civil sanctions are prospective in nature; they seek to coerce compliance at some point in the future. That point might be immediate compliance in open court or whenever the contemnor chooses to use his ‘key’—namely, compliance—to open the jailhouse door.” – In re Marriage of Betts, 200 Ill. App. 3d 26 (1990) (emphases in original)