Sorry guys, but which ever job pays more is the priority. The lower paying company should understand that you need to pull more time where ever you make more money. Shouldn't matter where you were first. I'd go in, talk to the store manager, explain the situation. If they aren't going to work with you, quit. Says you can't be two places at once and you are doing both a dis-service by working too much or skipping shifts because they won't work with you.
Do you guys really think that the big wigs at Target care about somone's working hours. It's a pride thing of the manager who he's dealing with. They may just be trying to get him to quit or justified firing.
-Andy
