Apparently you came to the store yesterday.
You must go at once.
You should have been finished with that by yesterday.
You should have come right away then.
You had better go at once.
You should have come a little earlier.
You should've come a little earlier.
You came late.
Please do that as soon as possible.
Were you here this morning?
You should do that right away.
You should do that soon.
Were you here last night?