Im at the green house part and i got the spell and i cant get back inside the green house do u know how to get out

hi errm try to use the spell to help you??, also look around the greenhouse u might find something of interest, i have completed the game but i have tried to replay it i was bored if you could help me as i have helped you, i really dont understand the spongify challenge i went into the door that was locked i did the alohomara spell i did all that was needed to be done in there when i wanted to get back out the door wouldn't open, do you understand why? also can the spongify challenge be completed if i do not go into that room cuz it locks me in there? and i have tried not to go in there but i still dont understand anything please help me! i have completely forgotten how to do this! and its pissing me off! much love xxx

also reply to my thread it will be named spongify challenge problems x thankyou