Robins have built a nest in our shed where our rabbits live. Which is lovely, but we lock the shed at night, is this ok?

We’re very excited that 2 robins have made a nest in our shed, in a bale of straw on top of our rabbit hutch. 
my only concern is that we close the door at night, as our rabbits live in the shed! They have open access to the whole shed. 

We’ve only found the nest tonight after noticing the robins going in & out over the weekend. 

any ideas what we should do?