It's ok--game jams are a good way to test out ideas quickly as a prototype. I did read the description but did not feel or see any easier or faster to loot, whether I had pinged the jewelry case.
Here are some silly ideas you may think about… Perhaps the player needs to tap (ping?) the glass several times to break it open. (I am not a professional robber :D , so I am not sure what ping does.) The more you tap, the larger the crack gets. The crack in the glass will serve as visual feedback to the player. So, if you crack it once during the day, you will have one less tap needed during the night when you loot. And if you crack it too big during the day, you risk being arrested by the security guard right there. To build on that, you could also have thicker glass that requires more taps for higher-value jewelry.
Another silly idea for the entrance and exit at night… as your game reminds me of the old 'Mission: Impossible' movie… :D At night, the player could come in from the top, hanging on a wire like Tom Cruise's classic ‘Mission: Impossible’ stunt. Then, exit using the same wire, reeling back up. You could still play the truck-escaping cutscene animation after the player has exited the top. The wire-reeling up and down could be another gameplay mechanic, too, not just a passive animation. Besides being a silly cinematic, this wire act could distinguish the vibe between daytime and nighttime visits even more.