Baby robins in my shed

Hi all

I have  robins nesting in my shed and it’s been absolutely amazing watching the parents going in and out of the shed via a small hole at the top of the door.

I am concerned how the chicks - when they are ready to leave the nest - will get out. Will they be able to navigate to the hole at the top of the top or should I open the door slightly?

up to now I haven’t opened the shed or been in since I found the nest - had to go and buy some new gardening tools as I didn’t want to disturb the birds!

any advice is very welcome.

thank you!