AITAH for wanting my OWN parking spot back.

Each day I get home after work right when middle school is released for the day (around 4 pm). The school is right across from my apartment complex and parents keep using my assigned parking space. I’ve left notes multiple times and yet they continue using my spot. It’s gotten to the point that I want to block them in and go shower, change clothes, etc.. basically leaving them there so they learn their lesson. What are some other petty but comical things I could do to them? I’ve threatened to have them towed but it doesn’t seem to worry them. Thanks in advance!