Thank you for all for the different suggestions for removing locks. I thought mine were McGard but turns out they are some long forgotten brand so getting a new key was out. McGard only made an old model with 8 splines. Mine had seven. The sacrificial 12 pt socket or a tool like the Craftsman Bolt-Out works best with a spline lock. I went with the Craftsman tool kit for $20. The first one took several tries before I finally got the hang of it. It takes pounding with a hammer in a rocking pattern to get it to seat and then slow pressure from your breaker bar is all it takes. Just repeat if it fails to grab. A good reminder to always torque your lug nuts particularly after you've been to a shop. I would have had a hell of a time if some shop torqued them a lot more. Another tip, using a torque wrench, tighten all the nuts an extra 5-8 lbs except for the lock nut, thereby easing the pressure on the lock nut. In extreme cases, weld a bolt or nut to the lock nut. Another last ditch method if nothing else works: remove all nuts. raise wheel, spin the wheel so the lock nut is at 3 o'clock position. apply brake and lower car so some weight is applied to the tire. raise car, spin lock nut to 9 o'clock position and repeat. The rocking and the pressure will loosen the lock nut. This method results in no damage to the wheel and may be the last resort if the nuts are deeply recessed, or you have no access to tools.
glenmore
1990 LS400
1991 300CE
2000 C280