[Python] Change dash Checklist values by callback

I would like to change the selected options of an plotly dash checklist by an callback. My minimal working example is as following (Values should change by hitting the 'load' button -> at loading the page nothing ist selected, after click the button 'SF' should be selected):

import dash

app = dash.Dash(__name__)

app.layout = html.Div([

dcc.Checklist(
options=[
{'label': 'New York City', 'value': 'NYC'},
{'label': 'Montréal', 'value': 'MTL'},
{'label': 'San Francisco', 'value': 'SF'}
],
labelStyle={'display': 'block'},
value=[]
),

html.Button('load', id='load-button', n_clicks=0)
])

@app.callback(Output('checkliste', 'value'),
Input('load-button', 'n_clicks'))
def change_values(n_clicks):
if n_clicks > 1:
return ['SF']



if __name__ == '__main__':
app.run_server(debug=False)

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