Valentine's Day Dilemma

Your classroom Valentine's Day party is planned this week! Valentine's Day is one of your favorite holidays. Valentine's Day cards and candy are the best part! You have spent all week shopping and preparing for Friday. Not to mention, you spent two days hand making all of your Valentine's Day cards for each one of your classmates.

On the day of the party, you want to make sure your cards are safe, so you ask the principal if it's okay to place them in their office. But, when you go to get them right before the party, you find the office door locked with your cards inside! You have 30 minutes until the party starts - do your best to solve these puzzles and unlock the office door!