I don't think geese are all that vicious. Certainly no more vicious than the fighting 'cocks' that are bred for cockfights.
And back when I was in college, I had a job to feed the 'fighting cocks' and collect any eggs laid by their hens.
Now, they were vicious, with razor sharp spurs about an inch and a half long.
But still, all you'd have to do is just boot them away when they got to close. Of course, they'd come right back, so you'd have to do it again... and again... and again.
Eventually, they learned.
Once me and the tech support manager were kept a few feet back from the card swipe at the building's door by a herd of Rhode Island reds. The roosters did not appreciate us approaching his harem. Well, then. The V.P. of software walked up and told the tech support manager they belonged to the company, and we were going to get some sheep to graze on the lawn. (ya, right.)
The tech support manager told him "just don't tell the tech support guys."