Can a Debt Collector Garnish my Wages?

I reside in PA and a debt collector called me and told me that if I didn't pay them $1500 by the end of the week they would take me to court and garnish my wages. I thought only the government could garnish wages? I told them I could pay them by the middle of July but they didn't care, they want it now. Obviously if I had it now my account wouldn't be with a debt collector.

 

Any help would be appreciated!