少々おまちください is a very polite way to say ‘Please wait.’
少々 is しょうしょう in Hiragana. It means ‘a bit’. 少々 is a polite word. You usually use 少し（すこ・し）for the same meaning.
おまちください is same as まってください. まって is てform of まつ which means ‘wait’. ください means ‘please’ if it follows てform.
おまちください is much politer than まってください. In the video, he speaks to the man politely as he is a son of their boss.
You can listen to the word and understand how to use it in a conversation.