Almost certainly Hawthorn ( _Crataegus_ ) genus. This is a fairly common genus of flowering and fruiting shrubs to small trees that produce white flowers in the spring and small red apple-shaped (pome) fruit in autumn. Species are found wild all over the Northern Hemisphere and are invasive in a number of countries in the Southern Hemisphere.
They are characteristically quite thorny (as you can see in your photos 2 and 3), with the spikes being actually short stems. Leaves arise from the short spurs off stems and several species have deeply lobed and/or serrated leaves (leaves have both in your photos).
There are quite a few species, but which one this is, I don't know.