discord.py SyntaxError: 'await' outside function

When I try to run the command I always get this error message: SyntaxError: 'await' outside function Very simple mistake probably, but I really don't see the mistake in it. Can anyone help?

@commands.command()
    async def unban(ctx, *, member):
        banned_users = await ctx.guild.bans()
        member_name, member_discriminator = member.split('#')

    for ban_entry in banned_users:
        user = ban_entry.user

    if (user.name, user.discriminator) == (member_name, member_discriminator):
        await ctx.guild.unban(user)
        await ctx.send(f'Unbanned {user.mention}')
    return

discord.ext.commands.errors.ExtensionFailed: Extension 'cogs.unban' raised an error: SyntaxError: 'await' outside function (unban.py, line 20)