Volvo 2007 S40 wont start

Put key into ignition, not to start the vehicle but, to turn it on to get the 12V accessory plug (cigarette lighter) to come on. Every thing came on fine to include the radio but when we went to turn the key off it turned back but nothing turned off. We turned to start positioned and nothing happened. Think we did hear fuel pump. Vehicle did not attempt to start. The car was in park, the steering wheel was out of the locked position. Several attempts both ways with key produced nothing. Then attempting to remove key we found that the key would not come out either. The radio was on during most of this time but there was no control over it to include off/on and volume. Playing with key back and forth has produced no change. Key still in ignition. Gear shift stuck in park at any key position it seems. Battery has good voltage.