job persistence not working

# Using picklepersistence-
def test(update, context):
    with open('files/user_data', 'rb') as f:
        context.bot_data['last_sent'] = 'today'
        print(context.bot_data['last_sent'])  # Prints 'today'
        print(pickle.load(f))  # Output is saved and is shown in bot_data

dp.add_handler(CommandHandler(command='test', callback=test))
# Above code is run by calling '/test'. bot_data is saved between bot restarts.

def test2(context):
    with open('files/user_data', 'rb') as f:
        context.bot_data['last_sent'] = 'today'
        print(context.bot_data['last_sent'])   # Prints 'today'
        print(pickle.load(f))  # 'today' is not saved and its attribute is not printed
updater.job_queue.run_repeating(test2, 86400, first=1)

# Above code does not save bot_data between restarts