During the robbery he opened up and loaded the shot gun in front of the staff member.
"The threat implicit to the [victim] was a very frightening one," Judge Cooper said.
Days later, on October 9, Morrison drove a vehicle, which had been unlawfully taken, to the ANZ bank in Greerton where he entered the building partially disguised, carrying a note which said "this is a hold up".
He passed the note to the woman at the counter, carrying a bag with a stick inside which was made to look like a gun, and demanded money.
He fled with more than $5500.
Judge Cooper said Morrison's offending had greatly impacted his victims.
"The [victim] had to take time off work because of the stress she was under as a result of this incident.
"The same occurred with the [other victim] who is still fearful and anxious about what you did. The incident is still with him."
Judge Cooper said he could not decide which was the greater charge, as in the ANZ incident, no real weapon was used, but there was a greater degree of pre-meditation and more money was taken.
Morrison's lawyer Andy Schulze said a hurdle in a personal relationship had partially caused Morrison's offending to "spiral out of control".
In reaching the sentence Judge Cooper took into account Morrison's previous convictions, including multiple dishonesty charges, and his early guilty pleas.