The bus will not start. I do not believe it is the battery. The key goes into the ignition switch, but does not turn.
It sounds like you may have a problem with your key. If the key is excessively worn it will not be able to unlock the ignition cylinder so you can turn the key. I would ask for help from one of the mechanics at YourMechanic to check your key and ignition to see exactly what the problem is.
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