five o'clock
This seemed easy work , and both of the young clerks said they understood what was wanted . Then Hamilton Dart put on his hat and left the office . `` I wo n't be back this afternoon , '' he said . `` Lock up at five o'clock , and you , Bray , can take the key . '' `` Yes , sir , '' answered Harry Bray . `` This is n't very hard , '' was Nat 's comment , when he was left alone with his fellow clerk . `` It is about as easy a job as I ever struck , '' answered Harry Bray .