A TRACON Controller reported they turned an aircraft left when they meant to say right and the aircraft flew below the Minimum Vectoring Altitude.

Narrative

Aircraft X is inbound to ZZZ and requests RWY XX visual approach while we are landing RWY XY. I coordinate with the RWY XY controller for sequence to the intersecting runway and then call ZZZ tower advising them that Aircraft X will be on a visual approach to RWY XX. After coordination is accomplished; I start vectoring and descending Aircraft X to RWY XX. After I point out the location of the airport the pilot asks me if I am setting them up for the RNAV visual approach which was not their initial request. I tell them no and then they tell me that's the approach they need. At this point they are well past any fix I could give them to set them up appropriately; so I have to bring them back around for another approach. This is where my problems start. I tell the pilot by mistake to turn left heading 250 when the more direct route and intended direction of the turn was a right turn heading 250. This unintentional left turn points Aircraft X at a 7;000-foot MVA while he is at 6;000 feet and as soon as I realized what's happening; I issued a low altitude alert and climbed him to 7;000 feet. I initiated the climb prior to him entering the MVA but he was too close to the MVA area; and I lost MVA separation within seconds of my clearance. This was a verbal error by myself which I will just have to be more careful of in the future.