Funny enough I went to Canada for a quick trip in with my (non-real ID) driver's license and birth certificate, stayed a couple extra days, and arrived back at

Funny enough I went to Canada for a quick trip in with my (non-real ID) driver's license and birth certificate, stayed a couple extra days, and arrived back at the border just hours before the switchover to requiring a passport/real ID went into effect. I wonder what would have happened?