You were the doorman and it was time for your shift to end.

When you went to the staircase you see the milkman walking up the stairs, his uniform was messy with a red substance he claims that was ‘Scarlet Milk’ they were working on in the milk factory

You walk up the stairs and realize you and him lived next to each other. So when you made your way to your apartment, he was standing there at his door as if he’s locked out.