Staff at McDonald's Te Ngae took refuge in a safe room and called police after identifying a drive-through customer as potentially dangerous.
Restaurant owner Rob Parry said on Tuesday night a man came to the drive-through speaker and immediately aroused suspicion with the questions he was asking.
"He asked 'are you here by yourself?' which clearly freaked out the person taking the order who said no, there were five or six people on site," Parry said.
"Then they proceeded to the drive-through window and were acting suspiciously. Thankfully we had some senior managers on, who took over the order.
"The person had difficulty swiping their card, they appeared to be under the influence, and they were trying to get us to reach out and do the Eftpos transaction for them."