My Y6 DS wants to start walking home with two others from his class, no problems with this, we are ensuring they know which route to take etc. I know both the other mum's. My worry is that at the moment he is briefly in after school club twice a week. On those nights I will be back about four o'clock, and DS1 about five to four, while DS2 will probably get home between 3.45 and 3.50. Would it be unreasonable of me to give him a key to let himself in for 5-10 minutes on his own?